Cabo Corrienties is a town and a municipality (a 75 kilometer stretch) that starts after Boca de Tomatlan and includes Yelapa, Las Animas, Quimixto and Chimo. The boat captain could have been speaking of the little villages on the coast as being in the Municipality of Cabo Corrientes (cape currents)
Waterfalls can be visited from Yelapa and Quimixto. There are also some smaller waterfalls along the roadside on the way to El Tuito in the rainy season. (not great for swimming but pretty and the spray is refreshing :) You can take a water taxi to Yelapa or Quimixto.