For Philadelphia:

Italian Hoagies: My favorite is Carmen’s at the Reading Terminal Market (get it on a seeded roll … their rolls are fantastic), which has a bunch of stands that may be of interest in it.  Having said that, I’d go elsewhere for hot sandwiches (cheesesteaks and Italian roast pork sandwiches, two Philly trademarks).

You can get outstanding examples of both of those sandwiches at John’s Roast Pork on Snyder Ave. in South Philly, which is not open at night. If you have anyone with you, I recommend getting both a cheesesteak and a roast pork sandwich and splitting both.

I would also try to get an old-school South Philly Italian meal for dinner one night. My favorite place for that style of food is Dante & Luigi’s on 10th Street in South Philly.

You may also want to consider hitting the 9th Street Italian Market in South Philly during the day Saturday.  There are a few good sandwich places around there, as well as Villa di Roma, another place that serves South Philly style Italian (like Dante & Luigi’s with a more casual atmosphere).