We were lucky and had fantastic weather the day we took an almost day long tour along the hochstrasse. Great views, lots of photo ops. You can see Switzerland and France on a clear day. Great places to stop for delicious food too! See my review on the Mummelsee Hotel - we stopped there for lunch. We were also fortunate to have rented an Audi - super fun - be prepared for great corners and wonderful stretches of road - really memorable driving experience. Will do this again when back in Germany for sure!
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