I used to live in NJ, and we visited Philly a number of times. The Philadelphia Zoo is the nation's oldest, and it's excellent. They have a newish exhibit space for their big cats. The old architecture within the zoo is very cool. Take the Ben Franklin Bridge just across the river to Camden to see the Adventure Aquarium. Very awesome space. My daughter loves the hippo exhibit, and spent nearly an hour just watching them swim from the underwater viewing room. It's very large and impressive. There's also a minor league ballpark very near the The cheesesteak "war" is pretty funny, and the two classic places are at 9th and Passyunk as jimmyjeromehardy7 mentioned above. Pat's King of Steaks is the original, and is housed in an unimpressive looking, but still cool little building, while Geno's is across the street and full of neon. There's another group of cheesesteak places called Steve's Prince of Steaks that is also very good. And another guy (Rick's) who is part of the original Pat's family has a place in the Reading Terminal market across from the convention center. The market is cool and worth a walk through, if you're in the area. And cheesesteak is good and greasy wherever you get it, though again, I'm partial to Pat's and Steve's. I'm not as into the history stuff in the Central City section of Philadelphia. The Liberty Bell is there, on display, and it's cool. . .but it's a bell. They do have tour guides around, if you're into the history, but the old courthouses and meeting places for our nation's founding fathers are all in Federal-style buildings that are kind of dull in appearance--in my opinion. There are some ships docked in the harbor. . . some warships, a schooner. . .we never visited them, but I think some accept visitors. Outside of Philly, you're not far from Bucks County, a very pretty area along the Delaware River. There is also Lancaster, Bird in Hand, etc. The Amish settlements are fun, though a little too touristy. You'll find covered wooden bridges around a lot of that area, and can probably google the whole list of them. Very quaint. It should be beautiful this time of year. . .Enjoy the trip!