The Sea of Cortez is "the world's aquarium." You can expect sea lions, mobula rays, dolphins, and depending on the month, whale sharks, orcas, humpback whales, and even the majestic blue whales and fin whales.
Interactions are strictly regulated. For example, sea lion snorkelling at Los Islotes is done with licensed local operators who manage group size and time limits.
We do "marine safari days" where the goal is to observe whatever appears, with strict distance rules. We never promise guaranteed animal encounters; we promise ethical viewing.