Take a snorkeling tour to the Silfra fissure in Thingvellir National Park, a UNESCO World Heritage Site. This tour makes it easy to snorkel in the ultra-clear waters, with visibility of up to 330 feet (100 meters). Your PADI-certified guide will provide all the necessary gear, including a dry suit, and a heated van to change in. After your snorkeling adventure, warm up with a cup of hot chocolate. Please note that participants who are 60 years of age and older must have their doctor sign the approval form in order to participate.