One of the region's most popular hiking trails runs along a section of Rio Lençóis called Rio Serrano. It's surrounded by exuberant forest, now protected as municipal park. The reddish-color water is due to organic matter from the forest floor. You can bathe and relax in several natural pools—they look a bit like hot tubs—formed on the rock-strewn riverbed. There are also three waterfalls scattered around the surrounding hills, best accessed with a local guide. To reach the easily accessible trailhead to the river, head up the hill after Hotel de Lençóis.
End of Rua Altina Alves, Lençóis, Brazil