I love my Alt-Berg Hogg All-Weather Originals, made to measure for my skinny feet. They're a little bit heavy for any serious walking, but as motorcycle boots, they are the comfiest and most waterproof I have ever had and I love them; they didn't even need any breaking-in.
I have a pair of lightweight Raichles (Scout GTX LS), which are also very comfortable, but I've found them quite slippy on wet rocks, despite the Vibram soles.