My husband, 20 year old son, and I are traveling to Iceland in late March. We are arriving early on Sunday morning from the US. We'd like to start our trip with a visit to the Blue Lagoon. However, the Blue Lagoon doesn't open until 10 AM. Any ideas for how to spend the time between arrival at 6:30 AM and 10 AM when the Blue Lagoon opens? We will have a rental car.