The Retreat at the Blue Lagoon offers a unique environment for outdoor activities. Guests can hike through ancient lava fields, exploring black-rock formations, geothermal vents, and moss-covered craters. In summer, longer hikes extend toward the Reykjanes Peninsula's volcanic ridgelines, offering views over the Atlantic Ocean. Mountain biking and trail running are available for more energetic guests, while guided nature walks explore the geothermal zone's geology and ecology. In winter, snow-dusted lava trails provide quiet routes for walking and photography, enhancing the connection to Iceland's elemental landscape.