Mine's still Good Morning Blood Island... I love the distant thunder-clap at the start and the sound of the waves later on, and the main tune is so haunting yet at the same time so nice to listen to. It makes me feel nostalgic even though I don't have anything to be nostalgic about.
Climbing the cliffs is another favourite, though. I can imaging going abseiling with this music.
So far the music reminds me of the Curse of Monkey Island soundtrack... ambient but there's still a strong tune in there.