An effort to protect local beach access for the public.
You can get a boat from Itacaré to bring you to the base of the waterfalls (15 min ride). There you need to pay the fee of R$15 to visit the waterfalls. There is a little shop which sells, coconuts to drink, Cachaça, chocolate, cacao beans (dried and fresh). The waterfalls are beautiful and there are several pools to dive into. Here is a video which gives a good impression of the waterfalls.
The Prainha beach can be reached by a trail leaving from Ribeira Beach passing two waterfalls. There are guides offering their service but if you have offline OpenStreetMap on your Smartphone you can easily find your way by yourself. One recommendable guide is Léo (leocapoeira19@hotmail.com / +55 73999301064 tel/whatsapp).