Cano Cristales gets so crazy colorful in the summer that its nickname is "the river that ran away to paradise" (or just "the world's most beautiful river," if you hate words). But as with many such psychedelic delights, this 60 straight miles of trippy goodness can be tricky to come by -- tourists have to fly out to the small town of La Macarena, travel by boat for a bit, then hike through unmarked trails to find it. @aviendhae