Books: Lot 49
Museums: Philadelphia Museum of Art of course, Barnes (near PMA), Mutter Museum (really unique), Institute of Contemporary Art is cool and free but small, Fabric Workshop and Museum is also free and small and the exhibit going on right now is cool
Food: Triangle Tavern, El Chingon, Han Dynasty (Old City location is in a gorgeous building), Machine Shop (in Bok, for pastries), walk around Chinatown, Pizza Plus for takeout pizza, Ember and Ash, Tabachoy, The Tasty for vegan brunch, Pietramala or Vedge for a fancy dinner if you can get a res