I must see this! Austria's Green Lake in the Hochschwab Mountains is a hiking trail in the winter. The snow melts in early summer and creates a completely clear lake. The lake has a grassy bottom, complete with underwater trails, park benches, and bridges. This is amazing!
As manatees can’t survive in water below 60 degrees, they migrate to Kings Bay and the adjacent rivers every winter, which are an average 72 degrees all year round. So from November through March 2012, you can head to Crystal River, which is 70 miles north of Tampa, where it is the epicenter of manatee-watching, and go swim with these giant but affectionate creatures. - GONNA DO!