2 weeks in Feb/March - where do I go?

[mbshap]

I am going to take an extended spring break and have 2 weeks to go on a vacation somewhere. It will be at the end of february and beginning of march. I am considering (in no particular order):

1) New Zealand
2) Japan
3) Thailand
4) Brazil

Here are the things that I consider to be important for this trip: good food, good nightlife, ease of travelling alone, ease of getting around only speaking english, cost (I am a student).

I think given what I want to get out of this trip, I am leaning towards Thailand, but am concerned that 2 weeks is not enough to spend there. Also, I will have a month-long vacation in August that I am considering going to Thailand for.

Any advice or insight the fabulous members of this board can give would be much appreciated!