Twin Falls
Keep an eye out for the Twin Falls Farm Stand just after mile marker 2 on the Hana Highway. Stop here and treat yourself to some fresh sugarcane juice. If you're feeling adventurous, follow the path (colorful arrows point the way) beyond the stand to the paradisiacal waterfalls known as Twin Falls. Several deep, emerald pools sparkle beneath the falls and offer excellent (and a little cold) swimming and photo opportunities.
This site is on private property, and the family that owns it has implemented a paid ($10 per vehicle), first-come-first-served parking system to help prevent overcrowding. Indeed, this natural attraction has become a tourist hot spot, and although the attention is well deserved, if you want to avoid crowds you might want to keep driving. Note that the Twin Falls site is closed to out-of-state visitors on the first Saturday of the month.