The Golden Circle, a 300km (186-mile) circuit through some stunning geological landscapes, is perhaps the most popular destination in Iceland from Reykjavik, as much for its natural beauty as for its ease of access. The volcanic crater at Lake Keri, Gullfoss Waterfall, natural geysers at Geysir, and Thingvellir National Park, a rift valley with historic significance for Iceland, are among the stops. Thousands of previous visitors have given this tour near-perfect ratings. Year-round, daily departures. Starting at $53 per person.