from the tacony, you could work anywhere in the northeast.
from betsy you can easily get to port richmond, bridesburg, fishtown, northern liberties, etc.
the ben franklin would bring you into center city, chinatown, society hill, south street area, bella vista, etc
the walt whitman would bring you into south philly.
as a fellow jerseyian, i recommend against working in university city if you can help it. i did the commute for a while and it's just not an easy drive. over the bridge to 95 to 676 to the parkway. no good. i'd also recommend against fairmount, art museum area. but that's strictly based on commute. if you love the internship, the commute isn't a deal breaker, just a pita.
let me know if you need more specifics.