go over to Constitution Hall, get your tickets..and take the tour of Independence Mall. Then head out, grab a cab to 9th and Passyunk Ave...get a Gino's and Pat's Cheesesteak..each eat a half of each and decide which one you like best...then head back to the Mall, grab a horse-drawn carriage tour...

OR, if you don't feel like cabbing for the cheesesteak...you can lunch at Reading Terminal Market at 11th and Arch...indoor food market with many many options (including some good cheesesteaks).

Also, must have a philly soft pretzel with mustard from a street vendor.

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Or...

tour the art museum..pretty nice place..and you can run up the steps like rocky