Swim tantalizingly close to whale sharks, the largest fish in the world, on this 6-hour boat tour from Holbox island. After a safety briefing, cruise out to waters where whale sharks glide along and feed, and then hop in. A certified guide is with you as you admire the gracefulness of the gentle giants underwater. Follow this with excellent snorkeling at Cabo Catoche. Expect personalized attention on this small-group tour limited to just eight adventure seekers. Lunch and hotel transport included.