itinerary for visitors to Pittsburgh

Hello all, My friend is entertaining guests over the weekend who have never been to Pgh and I told her I would ask if anyone had planned an itinerary for any guests they have had in the past that have visited. I know there are so many great things to do here but was hoping someone had put it in some logical order to make the visit fun and covering all the bases so I could help her plan. Any ideas????? thanks, Susie