I took my second trip to Philadelphia this past weekend and got to see more of the parts of town I was actually interested in as opposed to all that boring historic stuff. Philly is small so you can walk everywhere!
If you can make a trip there, I highly recommend the Mutter Museum where you can spend a couple hours perusing body parts in jars(!), as well as the Magic Garden on South St where a crazy dude makes mosaic tile art everywhere.
And yes, I ate a cheesesteak.