I spent the day at Splash Lagoon Indoor Water Park in Erie Pennsylvania one day a few years ago with my family. We had a lot of fun here. It was nice to not have to worry about the weather affecting our day. There are two hotels attached to this water park and you can get packages that include your admission to Splash Lagoon and a room at one of the hotels. We did not stay at the hotel since we are only a few hours drive from there. We did spend most of the day there however. There is over an acre of waterslides, pools, and games. I think the wateslides are big and a lot of fun. There are a lot of things for little kids too. My children especially enjoyed the Tiki Treehouse that dumped 1000 gallons of water every 5 minutes! The temperature inside the building was 84 degrees and was pretty comfortable when you are wet all day. There is also a lazy river, a few kids rides, and an arcade. There is a small food court and the food there was okay. The admission price was kind of high, but worth it I guess condsidering all there is to do.