Philadelphian here
Depending on what your into ....
1. Olde City - Tons of historical stuff all within a few blocks walking about from 3rd and market all the way to about 7th and market street. Ben Franklin's place, constitution center, liberty bell, congress hall ....
2. Reading market terminal - TONS of stuff of eat and check out quaint little stalls - also near 11th and market.
3. Bars / clubs - Check out 2nd and market area at night: Tons of places all in a matter of blocks headed south down 2nd street ( nick's upstairs, Taste of cuba, etc ) Its the beautiful people and beyond at some places.
4. Delaware avenue - somewhat generic clubs ..... low rollers mostly
5. Food: Pat's is the place for steaks if you ask me, but try out pats and geno's -- they are across the street from each other.
alzo - you can ping me on icq 160541645 if you wanna talk specifics as to shit to do in the area as well