for beer, i highly recommend a bar called eulogy. they are a belgian style bar/pub/restaurant. something like 27 beers on tap and over 300 total. good stuff, too. try their frites (french fries).
we were there for memorial day weekend. had a good time, and were surprised by how friendly the people were.
a good place to see is the eastern state penitentiary. very cool, and kind of creepy. it's an old prison built in the 1830s that was abondoned in the early 70's and is now a big museum. right across the street is a nice place to get a beer and some grub called Jack's firehouse. it's in an, you guessed it, an old firehouse. my wife and i stopped and split a sandwich for a snack. they have fresh cut fries, and the crabcake sandwich was excellent.
avoid Ralph's like the plague. what a dirty trick that place was. no bueno.
we had a great pizza at a place called marra's. it was pretty cheap too. an 18" cheese pizza is $11.
after ward, go to john's waterice. it's kind of like a cross between a snowcone and sorbet. either way, they are super cheap, and a nice way to cool down after a walk.
for getting around the main part of the city, i recommend the "phlash" it's a trolley type bus that runs east to west and hits most of the tourist spots. an all-day pass is just $5.
one thing i liked as well was that all the taxis take all the different credit cards, since i don't like to carry around a lot of cash.
also, i recommend reserving your tix for independence hall online. they are just $1.50 a piece.
if you want to see the US mint, leave your camera at the hotel, since they have no lockers for you to put your stuff, and they don't allow them in the building.