If you're on the east coast I'd recommend the Snowflex camp. I just got back and it was the most fun I've had in a while. The coaching was really good and we were on Snowflex for 6/7 hours a day(morning and night seasons.)  Everyone there had such a good attitude. All the coaches and counselors were always happy and encouraging and there were so many good vibes there. There's really no way to explain it. Everyone was just so stoked.
There was a kid last week who would literally walk up the lip to the box, step on, and barely slide down on the first day and by the end of the week we has throwing 2s off, he could do a handrail, and was hitting the big kicker there. I hit a lot of features I would have normally been freaked about about and I threw a lot harder tricks. So you really can progress a lot but it depends on how much you want it and how much you put into it.
The dorms are fantastic. They're apartments essentially. There was a fridge and oven in them and 3 bedrooms(4 campers and 2/3 counselors per dorm). Plus every bedroom had it's own bathroom and maybe its just a chick thing, but that was awesome.
During the the afternoon we didn't go out skiing because it was too hot so there were other things you could do like go to the skatepark, go on the tramp, they had a rock wall, there was soccer, basketball, and a pool, or you could have gone back to your dorm and done whatever you want. The only complaint I had was the skatepark is super tight and there's no room for bikes. But other than that the activities were really cool. The second last day we had a huge dodgeball tournament too. It was like skiers vs snowboarders, counselors vs campers, etc. It was really really cool.
At the end of the week each group competed against each other and the winner from each skill group won a pair of skis. I won for my group and got a pair of lines and a crap ton of stickers, wax, hats etc. It was pretty awesome.
Also, it's not very expensive. I paid 725 for one week and I'm pretty sure I got my money's worth in prizes/swag. You could go for the full 2 weeks and still pay less than windells, Woodward, or coc. Sure it's not real snow but everyone says bringing it to snow is really easy. Overall, it was definitely one of the best weeks of my life. I say go there next summer!