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I assume you're in America but there might be some unique freshwater/alpine snorkeling experiences there. You'd have to look into them individually most likely. If you're in Europe, there are some cool places in the actual Alps.
>Gruener See, Austria
Pic related. This place is a bit of a meme destination, but it seems like it'd be a cool place for a day trip.
>Koenigssee, Germany
A pristine alpine lake. They don't allow gasoline motors on the lake and haven't since 1909. Also good for a hiking trip to the local glacier and for stopping off at the old St. Bartholoma's church to drink in the biergarten.
>Reschensee, Italy
A reservoir in South Tyrol. There are a few submerged structures, particularly a 14th century church steeple poking out of the lake. I think most of the church was demolished but there are still a few remains under the water.
All of these locations are quite cold and you'd need a wetsuit full of piss to be even somewhat comfortable in them. I've only been to the Koenigssee and even in the middle of summer it was about 15C/60F. The others are probably similar.
