My husband & I are planning on doing a day trip to the Ludwig Castles in Fussen from Munich. It looks like the Bayern Ticket is our best option price wise. We are planning on pre buying our tickets online. In doing so, can we book our seats in advanced or just show up when we want to go? Also, I'm not sure how long to allow for the two castles. Do you need to book our seats back to Munich in advance? We are also taking a trip another day trip to Zugspitze and would like to do the Bayern Ticket then as well. Since this is the day we are flying in (from another European city), I do not want to purchase these tickets ahead of time, in case something happens. Is there anyway to show up at the train station and purchase them right then? Or should we take our chances and purchase ahead of time?