Macopa,
Although dated, Don Street's cruising guide for the
Virgin Islands describes a number of good
mooring locations in Puerto Rico.
I've personally visited only
Culebra, Culebrita and Vieques in the Spanish Virgins, east of Puerto Rico. The
anchorages there are beautiful, and not crowded, except on the weekends when large
power boats come over from PR. Ensenada Dakity and
Bahia de Almodovar on Culebra's
east coast have free
government moorings, as does the central bay in Culebrita. Bahias Icacos, Salinas del Sur, and Ensenada
Honda on Vieques are lovely spots to
anchor, but have no moorings.