I've got a 12 hour layover coming up in PHL. While I could stay in the admirals club and recover my annual fee in adult beverages, I'd probably not be too happy after 4 or 5 hours. I've thought about leaving the airport and going into town, but looking for some input. I should arrive around 10AM, and would like to be back to the airport around 6ish to allow time to wind down and grab dinner before an overnight flight.

I've been to PHL before so I know I can get into town on SEPTA. I've visited the Liberty bell and nearby related attractions, and Eastern State Pen.

So, two questions:

• Anyone have any experience with baggage storage services in PHL? I've seen the websites (Stasher, BagBnB, etc). If I check my large bag, I'll just have a backpack which I could keep with me unless I go somewhere that will not allow them, but if I do carry on only, I'd need to store it somewhere.
• Any suggestions on things to do?