Usually I skip overtouristic attractions like the Blue Lagoon Iceland Resort & Spa but OMG this place was the best decision before leaving Iceland. I recommend to spend the day here on your arrival or one day before departure and book the full package with masks and drinks. It is worth it and a truly spiritual experience. If you want it empty like on my picture you have to stay for sunset as most people left by then. The photo spot is next to the first bridge on the right when you exit to the outside area (screenshot attached).