Philadelphia anyone?

I spent several weeks in Philadelphia back in 1969 as a Navy Reservist awaiting active duty orders. I only had to raise my hand each morning when my name was called, and then was on my own, so I saw all the historic sites and never had to pay since I was wearing my sailor suit. I even walked up the same steps that "Rocky" ran up, but I didn't stand on the top steps and dance. But then that was 7 years before Rocky did it.
Philly offers tours to visitors by foot, bus, trolley, carriage or anything else that moves. Best way to see it all, along with the information about each site. Just google Philadelphia tours and take your pick.