Neat list, still listening to them all, may I suggest:
I'd also add FFXI's Sanctuary of Zi'Tah. This has replaced all other music for me when I think of a serene forest.
Good list! Castlevania IV still has one of my all-time fav soundtracks. I'd also throw in for water-themed levels generally having fantastic music. Aquatic Ambiance, from Donkey Kong Country, springs instantly to mind, as well as the theme for Big Blue from F-Zero.