Replying to Visiting/roadtripping to Lancaster, PA from Concord, NH

My sister's going to school in Lancaster and my father and I are dropping her off this Wednesday (August 22nd) and taking things a little more slowly on the way back. Anybody have recommendations on things to do or see? I like record stores, quality food, thrift shops, mountain biking, and hiking (aside from skiing, obviously). PM me or post here with suggestions, although this is rather late.