From shifting tectonic plates to erupting hot springs and thundering waterfalls, this full-day Golden Circle tour brings together three of Iceland's biggest natural wonders. Stroll through Thingvellir National Park, where lava fields, lakes and forests shape the landscape, then head to the Geysir geothermal area to watch Strokkur burst into the air. Round off the day at Gullfoss, where glacial water crashes through a rugged canyon in a series of powerful cascades.