We had a great time! We stayed at the Double Tree on S Broad Street and were able to park the car on Friday and walk everywhere we wanted to go.
Went to the Franklin institute and the kids had a blast. My wife joked that I clogged the giant heart.
The boys, 6 and 4, were not that into Independence Hall but like the Liberty Bell. Maybe in a few years when they get to it in school it might be different.
Thanks for all of the info provided!