I can only narrow this down to two I think: Arbiter's Grounds from TP and the Spirit Temple from Oot. Arbiter's Grounds are a little irritating at times, but... the whole process of making it through the outside grounds to get to the dungeon is entertaining to me...and there's nothing like slamming into Stallord over and over...while frantically twirling up the spinner track.. adrenaline is there. Spirit Temple has a good assortment of puzzles...plus every replay I get to defeat Koume and Kotake whom I dislike so much...

As for the Water Temple... every Water Temple I play for the first time I get lost in because of something ridiculous. Bad memories.