Since you are from Canada, I am beginning with a suggestion close to home. This 47-mile trail along the west coast start off from Port Renfrew and goes upto Bamfield. It is ideal for a 5 to 7 day trip.

Here are the details of this trail:

Most hikers plan to be out five to seven days, camping in designated areas along the trail. The wet, often mist-shrouded route cuts through the rainforest and skirts along the coast, passing waterfalls, sandstone cliffs, and rock pillars. Although the trail stays close to sea level, it involves climbing some steep slopes and wading through rivers. Ladders and cable cars are used to cross some of the more dangerous sections.

 (Source: SmarterTravel.com) 

But, entry is restricted to only a few people to avoid excess tourist traffic. Hikers have to apply for a permit in advance for USD 97. Once you get your permit, then there is no stopping you. Most tourists do get their permit unless it is peak season when the crowd is too much. The peak months are July and August.

 (Source: Kate Dugas) 

Click here for some more adventure options in the North American region.

One of Croatia's newest national park in Central Croatia, this is a hikers paradise. It covers the northern part of the Velebit range which runs parallel to the Adriatic coast. However, this park is the least accessible national park in Croatia. From what I read, I figured that most mountaineers meet in a place called Zavizan and take the Premuziceva staza (Premuzic Path) road which leads into the park. You could possible stay at the climbers' lodge just below Zavizan. Covering a distance of 50-km Premuzic Path offers the best view of the coast. Also, during January the weather will be warm and pleasant.

Click here for more information. I also found this useful link on options for hikers in Croatia.

The highlights of the region:

Hikers will want to take the Premuzic Path which runs west of the forest road and affords an open view of the sea. Although the section between Veliki Alan and Ostarije is in a state of neglect, the highlight is the section through Rozanski kukovi which has the most memorable views. It is also accessible to even the moderately fit.

(Source: Northern Velebit National Park) 

From Island to Mountain (Source: Dinko Srko?) 

If you are looking for a whole new experience and want to meet some of the most warm people in this world, head to Bhutan. The trekking opportunities that you would get here are unmatchable. You could take the Chomolhari Trek in Bhutan. But, since it is a 12-day trek, you could extend your trip duration by 4 more days. I suggest that you don't miss it.

I found this good deal on this website called www.jetsetter.com. You would have to create your own login and then sign in to view the ongoing deals. But the rates are very high compared to the budget that you have specified. But it includes accommodation, camping, food, transportation and airfare Bangkok to Bhutan. Your entire trip cost would come to USD 6710. So you don't have to spend on anything else. If you are keen in something offbeat, this is the best deal you will get. Also, January is a good time to go. Mid December to early January is usually clear and dry making it ideal for trekking.

Here is a snippet:

All you'll need to carry is your camera and daypack (ponies will transport your gear). While there are plenty of forest trails, there are also high mountain passes with endless panoramic views; you'll see farmers separating wheat from chaff with long wooden sticks, women sowing seeds by hand and pairs of oxen plowing fields.

You'll share the first days trails with yak trains, cows, ponies laden down with supplies, and uniformed children returning from school. (One day they stopped me on the trail and sang me a song in Bhutanese. It was one of the most joyous moments of my journey.)

 (Source: Jetsetter.com - Bhutan: The Chomolhari Trek) 

Here are the details of the trek:

 (Source: Jetsetter.com - Bhutan: The Chomolhari Trek) 

Do also check out this review:

I went to Bhutan in 2008 and it was one of the most memorable places I have ever visited. It is a Buddhist country which is tucked away in the lush Himalayan Mountains and was secluded from the rest of the world for many years. The country is becoming "globalized" and I would highly recommend going there "sooner than later". You will have memories to cherish for a lifetime! Linda H 1 day, 5 hours ago

 (Source: Jetsetter.com - Bhutan: The Chomolhari Trek) 

Door to Heaven (Trongsa, Bhutan) (Source: Jean-Marie Hullot) 

Botswana is just the place for a great safari experience. I found a very cool 7-day itinerary for a safari tour in Botswana. The safari starts from Caprivi and ends at Camp Moremi. It broadly covers East Caprivi in Namibia and Okavango Delta in Botswana. The trip is a nice mix of safari, game drives, cruises, relaxation, motorboat rides and fly-fishing. Siyabona Africa, the company which manages these safaris, takes care of all your requirements. This is a good option since you are traveling alone. You don't have to worry about anything. You can just enjoy your trip. They will take care of accommodation, food, flights, entry and everything else.

Click here to make a booking.

Okavango Delta - cruising in a mokoro (Source: Geof Wilson)