I don't really dislike any of the dungeons. But i'd have to say my least favorite is woodfall.
Compared to the other 3 its just so mehh.
Snowhead was interesting and had a great atmosphere and an amazing boss, plus the knocking out the pillars was a nice touch.
Great Bay was so cleverly designed to actually challenge the player and had a cool boss, and is one of my favorite water dungeons
Stone Tower was creative (flipping the temple? i'd like to see woodfall do that, THEN we'd see some wood fall. ;] ) and utilized almost all of what we had in our arsenal. And the boss had a cool concept (battle was lacking)
Woodfall is just nothing special. Just a dungeon with a woodsy/poison theme. Decently easy, not much exploration, not much of a challenge, and the boss fight just consisted of blindly slashing at odolwa's feet