On a recent trip to Iceland, we booked a night at the Blue Lagoon hotel. The great thing about staying at the hotel was we completely avoided the crowds of tourists who just visit the Blue Lagoon Spa for the day.
During the three times we went for a dip, there were no more than 4 other people in the pool, which made the experience that much more enjoyable.
I found my skin to be extremely smooth after. I have to mention one thing I learned the hard way. Be sure to use the shampoo and conditioner provided in the changer rooms. My hair was full of knots and hard to brush for the next few days.
Overall it was an amazing experience, I highly recommend staying at the Blue Lagoon hotel if for nothing else but to enjoy the Blue Lagoon without the crowds.