Strap on crampons and skip the basic viewpoints for a literal walk on ice. This trek is grueling—budget seven hours for the steep, muddy climb through the peat bogs. The payoff is the neon-blue ice caves and the glacial lagoon. Book a premium small-group tour to ensure you actually get onto the glacier safely rather than just looking at it from the shore. Bring waterproof boots or prepare to ruin your favorite sneakers in the mud.
