I went on this tour, there is nothing to sign up for. There are no other activities that RS has you sign up for during the tour. Unless you want to go to an opera or concert during your time in Munich, Salzburg or Vienna, then on a free evening you can purchase tickets to see something at the State Opera in Vienna or a concert at a church in any of the cities. You can go on line and check out what is playing during the time your there in April. I was in Vienna twice after the GAS tour and the Munich, Salzburg Vienna tour, I went an opera at the Volksopera and I went to several concerts. There is plenty of concerts in all the cities. You can buy your tkts in advance or wait until your there. I bought my tkts all advance but I was staying afterwards in Vienna for four days each time.