Nautilus Belle Amie

Routes: A large modern vessel built for the Revillagigedo run, spending the winter season at San Benedicto, Socorro and Roca Partida with giant mantas and multiple shark species. The fleet's former Guadalupe Island cage program ended when Mexico closed that fishery-reserve activity in 2023.

Season: Revillagigedo season runs about November-May; boats reposition or run alternative trips in summer.

Character: Giant oceanic mantas, dolphins and shark variety

Prices: Generally $3,500-5,000 plus park fees. Mexican marine-park rules and fleet routings have changed abruptly before — the Guadalupe closure is the cautionary example — so verify current itineraries with the operator.

Departures: Departs Cabo San Lucas with roughly a 24-hour crossing.