Tarrafe natural park can be visited by canoa. Regural non tourist canoa trips to Sao Domingos leave everyday around 10am may vary with sea level from the harbour less than 3 euros as in 2008. It is possible to have lunch at Sao Domingos and return in the same day. If you want a customized trip talk directly with the fishermen.
"Tabancas", small villages around Cacheu, can be visited with local guides.