When it comes to size, the blue whale trumps anything that has ever walked, swam, or flown across planet Earth. Stretching roughly 80 feet long, these titanic creatures swim deep below the Pacific Ocean, feeding on thousands of tiny krill at a time—but like all aquatic mammals, they eventually have to come up for air. That's when they meet Blue Ocean Whale Watch.

Aboard a 60-foot sightseeing vessel, naturalist Kate Cummings spouts the aforementioned whale facts and much more. However, it's not until whales breach the surface or jump into the air that passengers truly comprehend their massive size. Even the naturalist herself—who has been on countless voyages—can't help but take a picture each and every trip. Ms. Cummings works alongside Captain Jim Davis, who's navigated the ocean currents and Poseidon's construction zones for more than 30 years.

The two head out in search of blue whales, humpback whales, and other marine life, including dolphins and sea turtles. The stars of the tours change throughout year (during the spring, summer, and fall, humpback whales make their way to Monterey Bay to feed on krill and anchovies), but passengers can always catch views and photos from the upper deck.