The Blue Lagoon was truly a once in a lifetime experience! It's a geothermal man-made lagoon filled with water (the entire pool is drained and refilled every 48 hours) which is believed to have healing powers. The lagoon is fed by the water output of a nearby geothermal plant.
There were only a few cons: It was more touristy than I imagined it would be and it was also pretty expensive.
The good news is that we had vouchers included in our Travel Zoo package - we got the entrance fee, an extra algae mask, and a drink all included. There was silica all over so you could literally just pull it from the sides of the pool and use it on your face as a mask. Our skin was so soft after we rinsed off the silica and our algae mask. We spent a couple hours basking in the thermal pool (temp: nearly 104 degrees).
Iceland - we had an amazing time! You honestly exceeded all of our expectations and we cannot wait to come back. We promise we will! As always, any travel or Iceland questions... ask away!