I call 2 gyms my home, well now 3 :] haha. The one I've been at the longest, they have open gyms but only for an hour for about 10 bucks. They seem most popular with little kids who have to be accompinied by an adult, and some team girls. The open gym starts out with the kids spliting up into the gym, they usually only open up a certain part, then later are allowed to go out. The team girls, or ex team girls, are allowed to do whatever they want. This gym also offers, all types of dance, there is a preschool program, and lots of clinics.
The next gym has something similar to an open gym. It's called a high school class, but really it's just an open gym with one coach able to spot you if needed. It costs 20 dollars a session, [for one and a half hours] but if you get a punchcard for 6 or 12 sessions it's a lot cheaper. The punch cards never expire, and you can come in whenever you want. This benefeits the gym a lot. At the open gym there are really no rules besides don't be stupid, and the general gym rules. It's mostly high school girls, and now a lot of skateboarders and snowboarders come and goof off because there preppy girl friends bring them [grrrrrr] and they basically just play on the tramp and text the whole time. There are about 5 of us who used to be on the team and work out. This gym also has a yoga instructer come in and that class seems popular for the adults.
The third gym is a rec. gym. This gym is actually quite popular and the coaches are great, plus they have a brand new facility. They have open gyms every Saturday I think, and they shouldn't be too expensive. Other classes that are offered are adult classes, and this is really popular. We actually have some adults come in who used to be national champions. Other than that there are no other unusual classes, this gym seems to do fine. Hope this helped!