Snap a picture in front of the Liberty Bell and then head to Independence Hall, the birthplace of the US where the Declaration of Independence and Constitution were signed. Stroll through Washington Park and then head east and explore the cobblestoned streets of Philly's Old City neighborhood or grab a bite at the Bourse Food Hall.
Wander down South Street and check out the bars, restaurants, shops (e.g., Philly Aids Thrift), and sights (e.g., the Magic Gardens). If you're in the mood for GIANT sandwiches and cakes, you can stop at Famous 4th Street Delicatessen, or join the time honored debate and compare cheesesteaks from Jim's, Pat's (walking down E Passyunk Ave), or Geno's. South Philly Barbacoa is also amazing - tons of food options here!
Head to University City and stroll through Penn's campus to check out where it all began for Liz and Adrian! Start at 33rd and Chestnut and wander through Woodland Walk, then take Locust Walk up to 40th Street. If you're thirsty, grab a beer at Local 44.
Philadelphia has an amazing food scene with tons of restaurants and BYOs to try. Here are a few links for some ideas: https://philly.eater.com/maps/38-best-philadelphia-restaurants https://www.phillymag.com/foobooz/50-best-restaurants/