Dorney Park and Wildwater Kingdom is located in Allentown, PA (about an hour north of Philadelphia). It is two parks in one- a theme park and a water park. Your admission ticket grants you access to both parks- it is a great value for your money.
The theme park is filled with fun and daring roller coasters and all the other types of rides you will find at an amusement park. Camp Snoopy is one section devoted to younger children and they will love it.
The water park is tons of fun as well. Lots of slides, a wave pool, lazy river and more. The water park gets very crowded, especially early in the day. Plan on being there first thing in the morning to get a beach chair.
Dorney is a wonderful way to spend a summer day. But if you want to avoid the crowds go on weekdays or early in the operating season.