Jeepers birthday parties are the easiest parties we've ever had. Everything is taken care of, the kids have a great time, and the prices are very affordable.
A $10 wrist band will provide you with access to all rides for as long as you care to stay. There are bumper cars, a merry-go-round, typical kiddie rides and a really fast little roller coaster. There are also climbing areas and video games.
The biggest downfall I can think of is their security. Children and adults have their hands stamped when arriving only if there is an employee lurking nearby. Mostly everyone comes and goes freely, which is a little frightening with so many children around. However, the kids have such a great time that the hard part is getting them to leave, not keeping them in. Also, it's not the cleanest place we've ever been... take along some wipes and use them often on your hands.