We are doing a Viking River Cruise that stops in Vienna. Viking was unwilling to provide arrival and departure times. They further implied that the boat stops at one dock and then moves to another dock downriver to pick up people from evening tours. We are looking to book an evening concert on our own. We understand the implications of not getting back to the boat. We are comfortable traveling in Vienna with public transportation. The concert is 8PM for 1 hour at St Peter's Church. Easy metro ride from and to the dock at the Reichsbruke I know they have tours from the boat that go later than that. Does anyone have any insight into how the handle the Vienna docking times and places?