Second Rehoboth, so much to do around there

For what it's worth I live near Harrisburg and you could do Harrisburg/Hershey for 3 days and easily fill your schedule (civil war museum, Chocolate world, pinchot state Park, lots of unique restaurants, maybe something going on at the giant center)

I wouldn't recommend state college, there's enough to do for 2 days, but anything longer and you'll be struggling to find anything worthwhile to spend your time on