Hi, California, PA is only about an hour from where I live. You'll be fairly close to Pittsburgh, so you'll probably want to visit there. Depending on what kind of stuff you like, there's lots of different stuff to do in the 'burgh.
A guide to Pittsburgh, Pennsylvania. Visitors' and Travelers' information ++ Pittsburgh.Net
Have fun on your trip.
edit: Are you into architecture? If so, when you are in PA, you are going to be pretty close to one of Frank Lloyd Wrights most famous works, Fallingwater.