Go swimming! You can take a little boat up to the Rhinefall, and then jump in the water and float down the river for 10-15 minutes. Then hop out and do it all over again!
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The town Stein am Rhein has a well preserved old part of town. Schaffhausen isn't far away either, has also an old part of town and the castle Munot. There are a few other castles near the Rhine Falls but I haven't been there.
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Go swimming! You can take a little boat up to the Rhinefall, and then jump in the water and float down the river for 10-15 minutes. Then hop out and do it all over again!
Make sure that you're in a place that's safe to swim. The falls themselves are quite dangerous.
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