Everyone has heard of Mount Gambier's famous Blue Lake, which glows an iridescent blue in summer. But the Little Blue Lake? Actually it's more greenish, and is much more accessible than Big Blue – there's a stepped walkway down the escarpment to the water. Cool off with a swim, but beware: the water is always cold and it's an estimated 45m to the bottom. It's 17km north of Port MacDonnell en route to Mount Gambier, not far off the Riddoch Hwy.