Have you attended any of these camps before? And do you want anything specific from these camps? I mean, are you going just to get more saddle time, or are you hoping to get some serious training?
If it were me, I'd go to the camp that offers the most riding time for your money -- which seems to be Cedar Creek. Plus, you'll have the benefit of knowing some of the people that will be there. That always helps when you're going into something new.
Pickering doesn't seem bad, especially since you'll be saving money, but it'll just be for one week. Unless they have some top trainers, I'd probably stick with Cedar Creek.
Kemur also seems like a good camp ... I can see why you're having trouble deciding now.
But if this is your first time going to camp, I'd just stick with the ones that are days only unless you're absolutely, positively sure being away from home for a week at horse camp is the best. thing. ever. I don't know. Maybe if there was an additional lesson every day it'd be a better deal. But it seems hard to top the offer that Cedar Creek has.
Also, I like the ones that offer you the same horse every week. I don't know about you, but I like having time to warm up to a horse.
These are all just my opinions. I hope some others will share theirs as well.