I'm here for business for a few days, and i'll have 2 days to explore philadelphia. Looking for some delicious, not too expensive chowhound favorites, including:
-a really great slice of pizza
-an organic cheesesteak (do these exist?)
-a nice place for a solo dinner (not too fancy, preferable about $20 an entree or less)
-any other not-to-miss destinations
any great ethnic food? organic or vegetarian restaurants that are worth going to?