There are those who say the roast pork Italian, not the cheesesteak, should be Philly's signature sandwich. I'm one of them. DiNic's has the best in town.
Chocolate dippedcookie at Famous 4th St Cookie Co is worth the calories. Flying Monkey has uniquely flavored buttercream frostings. Franks kielbasa and sauerkraut was a tasty sandwich.
Great place to grab food and people watch, but it's too overwhelming with no room to move, long lines, expensive food, and no where to sit. Go there for the atmosphere but be prepared for chaos.