Australia'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. So cool!
Mexico is beautiful. Another Pinner: My cruise stopped here last year & I enjoyed every minute. The water was crystal clear & warm. If you ever visit ask your taxi driver to take you straight to a restaurant called LA CHOZA...you'll thank me later =)