When I was younger I went to Indian Hills Camp in San Diego, which is a church camp.
I really enjoyed it, though they had this ridiculously crappy stairway thing to the awesome treehouse slide they built. The way up was this caged ramp made up of a slippery board with the occasional inch-thick board to act as a foothold. It never seemed all that safe to me when I was younger.
Course, now, I'm thinking I was just being over-dramatic, but I just remember this vividly for some reason.
But besides that, it was very fun. I wish I had gone more, but younger me didn't appreciate those kinds of things. Stupid younger me!