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 from the forts.

on this link, the institudo estadual do ambiente - inea, provides the bathing suitability of several beaches in niterói, including praia de piratininga, that can be used to guess water quality at the nearby praia do forte imbuhy.