I'll be in Pittsurgh (staying at the Sheraton in Station Square) for a week. During the day my husband and friends will be at a conference, so I'm on my own without a car until early evenings. I've never before been to Pittsburgh. Any suggestions on what to do/eat? I'd like a good (preferably healthy) breakfast place, a cafes for tea, places for lunch, etc...in general, delicious food where one would feel comfortable dining alone...thanks!! Also, any dinner suggestions are appreciated, too!