In North America during the spring: The best option seems to be Windells. The people I know who have gone have loved it and would recommend it. For proof just check out some of the videos. The cost for the camp is $1,249.00.
Reasons I would go: You can ride pow and hit up the terrain park.
In North America during the summer: If you really just want to work on your tricks this is the best option. The snow is soft, the coaches are great, and you can do a bunch of stuff of the mountain. Places range from Wndells to Camp of Champions to Momentum, etc.
Reasons I would go: If I really just wanted to work on my tricks instead of laying around a swimming pool.
In South America/New Zealand: This is a great option because you can ride pow and a really sick terrain park in the summer. Prices vary but the best option in South America is SASS. In New Zealand you have companies like Access Trips and All Star Camps.
Reasons I would go: Summer + Pow and pretty good terrain park = Lots of good times
Ask if you want to hear about specifics. Hope this was helpful.