these two hotels are the most convenient to são francisco beach, praia de charitas,   praia do preventório, and to praia de samanguaiá, in addition to praia de salinas, praia do cais, and praia de jurujuba, that are only a 10 minute taxi ride away. 

on this link, the institudo estadual do ambiente (inea)provides the suitability of several beaches in niterói, including praia de adão e eva (adam and eve), that can be used to guess water quality at the nearby praia do forte do barão do rio branco.