I'm spending a few days in Iceland, where I've come to participate in the PPSN conference
. This is as exotic as you can get without exiting Europe, and it's worth the while (and the hassle, if you go through Heathrow). You can't miss Jokullsarlon, Skogafoss, and almost anything ending with -foss or -jokull.
This is Skogafoss, on the southern coast.