Had today been Friday, the bus would have been free, as all public transport is free in Austria on Fridays; as it was, we were able to buy tickets on-line. We discovered, too late, that we were supposed to print them, but obviously we couldn't so we just left them on our phones and hoped for the best - and nobody checked them, so that was all right.
The bus dropped us, as I said, in the town centre and we wandered around finding Mozart's birthplace, the huge Mozartsplatz with the cathedral in the middle, and then the funicular up to the fort above the town. We didn't take that in the end, as they had no concept of just going there and coming back again or, better still, going there and walking back down. It was assumed you wanted to go to the fort while you were there, and the ticket prices reflected this. So we said thanks, but no thanks, and were deligbted to then find the upper entrance to the St Peter's cemetery with all the family graves in the walls. So we walked down there and then remembered that the SW's brother and his wife had been to, and loved, the eponymous restaurant. Sadly, it was too expensive for lunch, so after sitting in the courtyard for a bit we wandered back towards the main square and stopped to look at the Franciscan church before finding a superb value lunch at the university café - soup, roast pork, dumplings and salad for a total of €17.50 for both of us! I couldn't even finish more than half of mine!
After lunch, we walked a little farther and came across a random trolley-bus going somewhere, so we took it some of the way (and a wonderful view of the fort from where we got off), and then another bus back to the Hauptbahnhof and an S-Bahn to the local suburb here. Then another bus that would have taken us straight back to the campsite head we not broken our journey to buy eggs and butter (and an ice lolly each). I was done by then, so haven't moved since, but the SW headed back into town to do more exploring on his own.