agree with all above. Both Neuschwanstein and the and Rothenberg on the Tauber are wonderful. Very very touristy but wonderful. Same for Venice.
Munich is a beautiful city and I hit the BMW Museum and Deutsches museum.
I recommend driving some part of your trip. The roads are insane in the Dolomites and Switzerland.
You are tall. Some of the most common rental cars are the Fiat Panda and Fiat 500, which both have high rooflines and will probably work for you. You want a small car for the narrow roads and nimble handling.
Drive some if the passes for sure. This summer I drove Passa Giau and Passo San Baldo. This is one we just stumbled upon.
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You can plan a route to Venice to incorporate these.
Also in 2022 I drove across the Stelvio Pass and Bernina Pass. Both fabulous B roads.
In general, big cities in Europe are crowded and full of tourists from the US, Europe, and Asia. But the second you leave the cities for the smaller towns, the number of tourist declines precipitously. And everyone is less stressed.