Swim with the Gentle Giants Every summer, Isla Mujeres becomes one of the best places in the world to encounter the majestic whale shark, the largest fish in the ocean. Despite their size, these gentle filter-feeders pose no threat to humans and offer an unforgettable, awe-inspiring experience. Guided boat tours take you into the open sea, where you can snorkel alongside these spotted giants as they glide gracefully through crystal-clear waters. This seasonal adventure (typically June to September) is a must for nature lovers, photographers, and thrill-seekers who want to connect with one of the ocean’s most magnificent creatures in their natural habitat.