I've been to Iceland twice, one when an ETOPS (767) had to stop and they let me, but not the other passengers out (a separate story) and in October. TWA requires 60K, 70K if you want to go to Europe and stop in Iceland.
There are plenty of posts about Iceland. www.thetrip.com > hot talk has Iceland post periodically. There are a few websites. About 1.5 hours out of Reykjavik there is Geysir and the Gulfoss waterfalls.