I agree with most of the contributors that it's a lovely experience and a must-do in Iceland. Prepare to spend at least 2 hours in the pool. Don't look at the sand your feet dig into. It's full of hair - pretty gross.
Before our visit, we considered to stay at the Blue Lagoon hotel. Glad we didn't. Firstly it was made to appear really popular from 'reviews', and secondly we didn't see the hotel the entire time we were there. Heard it's 600m away. So unless you are there to help a skin condition, no reason to choose it. Unless you're overflowing with cash, then you may ignore my review.
If you have a car, stay at any hotel in Keflavik for about half the price of the hotel (just hotel, without entrance fees). The Blue Lagoon is a very short drive away.
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