Does anyone know how much time is actually spent in Lucerne during the Castles on the Rhine tour? We have a few extra days post-cruise (staying in Zurich) and are planning some day trips. I'm wondering whether a follow-up trip to Lucerne would be worthwhile, or would it not be the best use of our time given the time spent in Lucerne during the cruise? The full itinerary for the trip is unclear regarding how much time is left to explore the city between the trip up Mt. Pilatus and the Swiss Folklore show.