I've been admitted before and I can tell you that most of them are fairly okay, if you're fine with spending most of your time with a lot of other people. I was at one psych clinic that was likely underfunded and as a result quite unsanitary and lack ambience, so it really depends on the one you end up at.
The best advice I can give you if you want to get out asap, is to act as normal as possible, this might mean lying when they make you fill out those forms asking you to rate your suicidal ideation and stuff. They're not all that bad though, and it might be a good idea for you to stay there and use it as a place to heal. It's a little cathartic to be away from the outside world and easy access to technology, sometimes I wish I could go back. I know there are people that made some long term friendships from there as well.