If you are adventurous and love to do some different thing while you are in New York, then the best thing to do would be rent a bike and ride along the Hudson River. You can cycle the entire length of Manhattan and there are small detours you can take along the way, if you'd like. A great way to spend an afternoon exploring Manhattans lesser known treasures.

Summer Streets 2011 (Source: nycstreets)

Here is a biker's review:

Best place to ride your bike in the city considering there are not many cars crossing your path. But they do cross so you still have to watch out for that. During the weekends on a nice day it can get pretty crowded especially around midtown. I have seen a quite a few crashes as well as crashed into ppl that just stop short in front of me a few times.

(Source: yelp.com)

Riverside Park, north end - 11 (Source: Ed Yourdon)

There are many bike rental shop, but you can rent a bike from here as you will get a very good bike at a great cost.

Address: 117 west 58th street (just one block from Central Park)

Tele: 917 520 2066     

Prices: 1 hour $11.00 , 2 hours $14.00, 3 hours $18.00, all day $32.00

Hours: From 9am till 9pm

If you are someone who loves history and has been closely following the history of Germany when the Berlin Wall was torn down, then you will be surprised to see the Berlin Wall in New York City. Yes, you read it right. When the Berlin Wall was torn down, fragments and pieces of the same was brought down to New York as a reminder of another lifetime and erected here. 

Pieces of history (Source: Lauren Manning)

There is a placard carrying the name of the German graffiti artist whose work is portrayed here on the wall. This place on Madison Avenue is normally missed out by people, however you can check out the same.

Here is a visitor review:

Easy to miss, and probably not worth a special trip except for Wall completists. But interesting to look at if you're in the area. Out of context historical graffiti & some interesting design points (for example, the top of it is curved in a way to discourage grappling hooks).

(Source: yelp.com)

Address: 520 Madison Avenue, Courtyard, New York, NY 10079

Bronx Zoo is one of the best places you can head if you are a wildlife enthusiast and would love to enjoy the same African safari kind of experience which you would have missed doing ever in your life. This beautiful zoo is spread across 265 acres of lush greenery with the River Bronx flowing through and it is one of the best zoological parks in the world.

Bronx Zoo (Source: porlo)

There are different variety and species of animals, birds, aquatic animals, fishes, reptiles, insects etc. This spectacular zoo is open seven days a week and on every Wednesdays you can pay what you wish admission fee.

Here is a visitor review:

We spent the day with friends exploring the Bronx zoo. It is the largest metropolitan zoo in the United States. The zoo is well kept and we spend quite some time there. Other than the normal animals that one would find in zoo's, we got to see some of their main attractions like the Butterfly Park, Tiger Mountain - these Siberian tigers are taught games to keep them fit and stimulated, Madagascar - you can view all the different types of wildlife from the world's fourth largest island. Like leaping lemurs, hissing cockroaches, towering baobobs and octopus trees. We were unable to see the Congo Gorilla Forest as the queue was quite long.

(Source: TravelPod)

Tiger at the Bronx Zoo (Source: Chris Costello)

Address: 2300 Southern Boulevard, Bronx, NY 10460-1068

Tele: +1 718-367-1010

Open Hours: 10:00 - 16:30 daily

Rates: $18.00 per adult.

One unique thing to do in New York City is undertaking a Food Tour. It is an extraordinary experience of real eating tour and not a sampling tour. It takes visitors beyond the tourist attractions to the largest buffet in the world, New York City. There are various tours offered by many tour operators and you can take your pick on which specific tour your would like to go.

Food on Foot Tour (Source: Daniel Torres Bonatto)

The best food tours are offered by Food on Foot Tours Company. There are many variety of food tours like take a tour of the East Village Variety, Ice Cream -You Scream, Food for Fans Baseball & Stadium Tours, New York's Waterfront Villages - Brooklyn Tour, Sandwich Salvation etc. For more details about the tour please click here. Most of the tours last for not less than 3.5 hours. The tours from this company has been rated as a number 3 in NYC and this is one experience you will love to cherish forever.

Here is a visitor review:

My family and I did the East Village tour on our second day in New York. We went back to several of those restaurants during the rest of our stay and also received excellent references that we used when we visited other parts of Manhattan. It was also a fun time to meet other people visiting New York and compare notes. If you like delicious food at reasonable prices, you won't regret this small investment in money and time! We will definitely do this again on our next trip to the big apple!

(Source: TripAdvisor)

Food on Foot Tour (6) - Artichoke (Source: Daniel Torres Bonatto)

Address: Food On Foot Tours, P.O. BOX 444, Wheatley Heights, NY 11798

Phone: 1-631-491-0326     

Tour Timings: As the timings are different depending on tours, you can check the schedule here.

Price: Average $37.00 per person

The Annex is New York's most popular urban flea market which offers a myriad of shopping options. Haggle for the most spectacular, the most fashionable and the most bizarre. You'll find it all here. 

Named one of the Top Ten Shopping Streets in the World by National Geographic, Hell's Kitchen Flea Market sets the standard for distinctive vendors, where the fashion eclat, collectors and top-notch hagglers still delight at fine old things, memorabilia, original art & antique.

 (Source: Hell's Kitchen Flea Market) 

Canon @ Hell's Kitchen Market (Source: Mo Riza) 

Address and Contact: 406 West 39th Street, NY 10018 | Tel.: (212) 243-5343

Subway: 42 St - Port Authority Bus Terminal

Days: Saturdays and Sundays 9 am to 9 pm.

The Whitney Museum of American Art is the perfect place to go and experience some great contribution to American Art.It was started by Gertrude Vanderbilt Whitney who herself was a renowned painter and sculptor,she started the initiative by first introducing the Whitney Studio Club in 1918 which brought forward new and unusual talent.

Here is some more info

The Whitney Museum of American Art, often referred to simply as "the Whitney", is an art museum with a focus on 20th- and 21st-century American art. Located at 945 Madison Avenue at 75th Street in New York City, the Whitney's permanent collection contains more than 18,000 works in a wide variety of media. The Whitney places a particular emphasis on exhibiting the work of living artists for its collection as well as maintaining an extensive permanent collection containing many important pieces from the first half of the last century. The museum's Annual and Biennial exhibitions have long been a venue for younger and less well-known artists whose work is showcased by the museum.

 (Source: Whitney Museum of American Art -) 

Gertrude Vanderbilt Whitney (Source:n) 

Here is a review

Somewhere in between the academic nature of the MOMA and the audacity of PS1 lies a nice balance of strange but good at the Whitney.
I'm a contemporary art person but I enjoyed this museum a bit more than the MOMA and PS1 because it was more manageable and the art selection was very good.
Getting slapped in the face with a huge neon sign that said, "negro sunshine" started things off, with a great exhibit on Edward hopper, they have a large collection of his, and then a collection of recent donations and then a nicely put together exhibit from the collection.
The Edward Keinholz was so moving I almost cried.3 floors of art on my visit, one floor was closed for installation.There were 2 free tours on my visit.Gift shop.Free first Thursday's at night, but the line can be painful.

 (Source: Whitney Museum of American Art - Upper East Side - New York, NY) 

Location:Whitney Museum of American Art,945 Madison Avenue at 75th Street,New York, NY 10021

General Information:(212) 570-3600     

Email:info@whitney.org

Hours:

• Mon, Tue  CLOSED,
• Wed-Thurs, Sat-Sun  11 am–6 pm
• Thur  11 am–6 pm
• Fri  1 pm–9 pm

Fees:

• General admission: $18
• Ages 19–25: $12
• Ages 62 and over: $12
• Full-time students: $12
• Ages 18 and under: FREE
• Members: FREE
• Admission is pay-what-you-wish on Fridays, 6–9 pm

Click here to purchase tickets online.

Don't go by the name - it may sound creepy but a visit to the Museum of Sex turns out to be very educational! Post the visit, you can treat yourselves in the adjacent Oralfix Aphrodisiac Cafe if time permits (the joint's got some really wacky but thought-provoking menus!).

Check out a visitor's review on the Museum:

Very interesting with some room for improvement

The main negative comments we saw were to the extent that this is nothing more than an excuse to display porn. We feel that couldn't be further from the the truth! But, we've also noticed that museum goers fall in to two categories generally. One that just looks and one that looks and learns. If you take the time to look at the displays and read the accompanying material, it's very informative and contextual.

When we went, there was an area under construction so that was a bummer, but there was still a lot of cool stuff. If you go just to look, you can be done in 30 minutes. But if you take time to read and discuss, it will take several hours.

(Source: TripAdvisor) 

Do read this very interesting take on the Oralfix Cafe, which even includes some recommended menu options!

Buy your tickets online to avail a $3 discount! The entry is restricted to adults above the age of 18 only, so remember to carry a valid age proof.

Museum of Sex! (Source: Peiling Tan)

Address : 233 Fifth Avenue, New York, NY | Ph: (212) 689-6337 

Hours:Sun - Thu: 10am - 8pm | Fri - Sat: 10am - 9pm

Price: $17.50 + tax

You can book your tickets here

Click here  for a complete list of offbeat NYC sightseeing spots and here for the Top 10 picks. You can take your pick based on the time you have in hand.