I'm traveling with my 2 boys, ages 5 & 8 to Philadelphia. My wife won't be along so I'm outnumbered. I'm looking for kid-friendly restaurants -- we're staying in Center City, but will likely also be in the area of the zoo, the Franklin Science Museum and Liberty Bell -- suggestions for any meal in any of those areas would be very welcome. Also, a dim sum suggestion would be great. Haven't been to wonderful Philly in years and am looking forward to it!