2 nights in Philly
Will you have transportation within the city?
How old are your children?
What is your budget?
Without knowing that here are some ideas:
Chloe (in your area, delicious)
Reading Terminal Market (kid haven)
Standard Tap (good for kids, especially early, great local beers)
Franklin Fountain (for ice cream in your area, great for kids)
Amada (make reservations early, in your area)