We had a 7pm reservation. It is located towards Keflavic Airport approximately 40 minutes’ drive from downtown Reykjavik. We only booked this a week in advance, which made it a little more expensive and limited our entry time. So, book this AT LEAST two weeks ahead of time to save some money and add flexibility. We took our rental car, but there are buses that head to the Blue Lagoon as well. Deb and I stayed for 2 – 3 hours and one of us took full advantage of our 4 drink maximum at the outdoor bar. Deb indulged in one of the skin treatment options that they have at the lagoon as well. Although we didn’t find out until after, they have small, clear, waterproof bags you can rent if you want to bring your phone out to the lagoon. Overall, there were a good amount of people there, but you can wander around and find your own spot to get away from the crowds.