Loreto is Baja California Sur at its most relaxed: a walkable mission town on the Sea of Cortez with protected islands right offshore. Most diving and snorkeling happens by small boat (panga) inside Parque Nacional Bahia de Loreto, where volcanic islands create rocky reefs, pinnacles, and sea lion hangouts. Add winter whale season (blue whales are the headline), warm-water summer snorkeling, and uncrowded topside days in the Sierra de la Giganta, and you have a rare mix of wilderness and comfort.
Plan on boat diving rather than shore entries, carry your national park conservation bracelet, and build flexibility into the schedule for wind. Non-divers have an equally strong itinerary: island beach days, kayaking, golf at Danzante Bay, and day trips to Mission San Javier and the turquoise coves of Bahia Concepcion.