My two most memorable swims were in the Venezuelan Guyana Highlands and in the mountains of northern Honduras. In the former there were some little Corydoras like catfish about 3~4cm long, bright green with red spots. For the latter my wife and I sat resting on some rocks while we watched a bright scarlet king snake swim across the pool where we had been moments before. For me, there is nothing like catching a rare glimpse of native wildlife doing what they have been doing for millions of years. Walking up a ridge to the spot where we saw the king snake there were swift streams on both sides so you got the sounds of rapids in stereo.