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Be prepared for hugely expensive everything.
Spent more in 4 days there than a fortnight in Florida thereafter, and that was after eating in noodle bars a couple of nights because they are a third or half the price of the Rekjavik restaurants,.
Everyone goes to the Blue Lagoon for a swim, but you can get a coach trip out to the less crowded Secret Lagoon instead and see fantastic scenery on the 90 minute trip from Rekjavik.
You can walk the length of Rekjavik in 20 minutes, its small. There is an unusual museum at one end of the main strip, a look in the shop windows out front was more than enough for us.
What they claim to be the smallest watch factory in the world is halfway down the strip.
Take layers of clothing rather than polar expedition wear, actually in southern Iceland the weather was not bad in September when we went.
You can walk to the house where Reagan met Gorbachev.