Philly has great options - Hotel Monaco is new with rooftop bar. If you want B&B then Rittenhouse 1715. i love Sofitel.
Mural Arts offer a few tours - the love train is popular. The Barnes collection is fantastic.
Too many fantastic restaurant options to pick just a few. Lots of live music options at night
Philly will surprise you -so much more than history. DM me with any queries if you decide to visit
A different option -equidistant NYC and Philly I'd look at Inn at Woodloch - private, spa, activities but no nightlife