The MV Valentina runs Mexico liveaboard trips to two regions: the Sea of Cortez, for whale sharks, hammerhead schools, sea lions and mobula rays (Advanced Open Water plus 30 logged dives required), and the Revillagigedo Islands' Socorro, San Benedicto and Roca Partida sites for manta rays, sharks and dolphins (Advanced Open Water plus 50 dives). Seasons run November-May and August-November, priced at $2,890 for Sea of Cortez and $4,300 for Socorro, with all dives instructor- or divemaster-guided.