Critique my itinerary: 11 days in Switzerland, Germany, Austria in May

Trying to not pack too much into our family travels. Does this sound like a balanced itinerary?Nights 1-3: hotel in Zurich, 4-8 hotel in Munich, 9-11 in Salzburg.

Day 1: Fly into Zurich, stay in hotel south of Zurich, arriving in afternoon. No plans other than dinner

Day 2: explore Zurich city and tour Lindt factory

Day 3: train or bus to Rapperswil and spend the day there. No set plans

Day 4: travel day going to Munich. Only plans are train and dinner in Munich

Day 5: train south to Füssen, explore town and visit Neuschwanatein castle. Is inside of castle tour worth it or should we just do the hike around the outside?

Day 6: Dachau concentration camp and Englisch garden in Munich

Day 7: Nuremberg, taking train and debating a guided tour or exploring ourselves.

Day 8: day in Munich. No plans yet, this will be a bit of a reset day to relax, but maybe see Nymphenburg palace and the glockenspiel in the afternoon.

Day 9: early train to Salzburg. Steigl brewery

Day 10: explore Salzburg, visit Mozartplatz

Day 11: Sound of Music tourist tour and remainder of day exploring Salzburg.

Day 12: depart early AM