I just wrote up this list of activities we've encountered in PA and I thought I'd post them here for all to peruse!
These are locations we've actually visited and enjoyed with websites so that you can plan your visit!
If you're in central PA, there are several free places to visit. In Harrisburg the state museum is free. http://www.statemuseumpa.org/ It's not hands-on, but my guys still enjoy it. You can also visit our state capitol building right across the street. It is also free and has a very interesting hands-on orientation room. The capitol itself is also very interesting, beautiful, and ornate. http://www.legis.state.pa.us/cfdocs/legis/home/toursWelcome.cfm My guys LOVE to visit the capitol building.