My brother has lived in Iceland for over 20 years, and my daughter went last summer for a grad present trip to visit. She really enjoyed a walking food tour of Reyjavik, she went to the Blue Lagoon but it was quite expensive and she said the public pools were just as good, geothermal pools with multiple different-temperature pools in one place. The food tour is great because restaurants can be pricey and that way you get to try a lot of things as well as the hosts were fun, I'm sure if you google reykjavik food tour you'd find it. Have fun, I'm jealous!