Oh man, I love me some Lucifer's Friend. Every album is different! My favorite is Banquet.
I always considered Krautrock to be a specific type of instrumental/experimental stuff, but I dunno. Klaus Schulze, Tangerine Dream, stuff like that. When I was younger I went on a cross country motorcycle ride (I have a BMW airhead, of course), and a couple park rangers in Yosemite recommended I check out NEU!