My only time I spent in Philadelphia was a stopover on the way to Las Vegas (no direct flights from the UK, I wonder why).

Out flight was 4 hours delayed and we missed a connecting flight and had to wait till the next morning. The airline provided a hotel that was about 20 miles away and a single minibus with about 15 seats to shuttle 150 passengers. We were travelling with a baby. No one would even think about offering priority to families with little children so I had to be quite assertive to get a place on the third or fourth turn of that minibus.

On the positive side, the stopover completely eliminated my jet lag. I have travelled a number of times to the West coast and found I needed a few days to adjust to the 8-hours time difference. With a sleepover half-way through, I needed no adjustment at all