I went to UCLA camp last summer and it was great. It's only a weekend and I stayed overnight. The UCLA gymnasts and alums (some from UC Davis also come) coach.
They put you in counsellor groups and training groups. The training groups are pretty self explanatory, they're training groups. The training groups are split into 2 different gyms, one is the main UCLA team practice gym and the other is a multi purpose gym. In the training groups the "teams" do different competitions and games. The counsellor groups are more like regular summer camp groups. Most of these groups are mixed levels and ages.
Each year they move the camp to a different dorm so, it's different every year.
You also meet really cool people, my roomies were twins who were in the Nastia Lukin Cup and were committed to UCLA.
If you do travel it's also a good idea to look at other colleges in the area, even if they don't have gymnastics.