My sister and I visited Bear Lake at Rocky Mountain National Park 20 years ago when we were single, childless, and in our 20s. I remember taking a tour around the lake at night. It was guided by a Park Service ranger. We were told to partner up and one partner (my sister) blindfolded the other partner (me). Then we blindfolded people were led by our partners for a few hundred feet. We could not see anything (but it was dusk anyway) but we could hear, smell and feel the park. Wow, that was an impressive tour!