The school itself has a pretty decent cafeteria. There is also a vendor that usually sets up shop across the street which I've heard is pretty good (never tried them). One of the best places to get food if you're on campus is the hospital across the street. They are not affiliated with Geisinger anymore, but they still give students 15% off (and the food is already cheap). It's my favorite place to get food when on campus, and it is surprisingly good for hospital cafeteria food.
One of my favorite places for Sushi is a little place called Yume about 10 minutes north of the school. There is an amazing tai place called tai tai in center city. Plenty of bars and whatnot in center city as well if you're into that.
Otherwise, there are tons of nice places to grab food like 2 blocks downtown from the school. And Coopers seafood (Yes, from the Office) is a 2 minute walk from school.
No gym for students, but there are a bunch of places around town. Don't have a recommendation, as I work out from home, sorry.