N.L.
I had a bday party for my daughter at YMCA in Arlington. It was real easy and cheap. You pay more if your not a member but if you know anyone that is a member there, they can rent the space for you over the phone. They don't have to be there in person. I want to say it was like $120 for up to 40 kids. They swim(heated pool) for about 1 hr and 15 mins. They you go to a party room where u can serve cake/food etc. They have tables and chairs provided. There is a small kitchen w/sink and fridge for serving. The YMCA doesn't have near as good of a set up for parties as the one in Arlington.