I've been reading all the posts about doing this day trip. For some reason, this is confusing to me, although for the most part, I think I've figured it out. We will go to the Vienna Westbahnhoff, buy a combo ticket - train-boat-train. Take the train to Melk, tour the abby. Take the boat (is this on the ddsg boat?) to Krems. Take the train back to Vienna from Krems. If we do this option - does the boat stop in Durnstein? Or should we skip the combo ticket, and make our own arrangements? If we do that, how do we see Melk, Durnstein, and Krems?