I absolutely loved the Earth Temple and the boss for the Forbidden Forest. That mirror puzzle was the coolest. Just the fact that you had to use the mirror shield was cool enough. And who didn't just go 'wow!' when you had to use Medli's mirror to blow away all that cloudy stuff on the floor at the beginning?
The enemy that I was surprised at most were the Poes. I totally forgot it was them, cause it was a different way of beating them. But the one that scared me the most was the Redeads. Man, that screech is freaky. Even Link thinks so. The floormasters weren't scary, just the fact that it was hard to hit their arms, and if you left them for too long, they would just suck you in.
But I finished it, and I just wanna play it again and again. I went back to Ocarina of time, and to me, it just became the most bland, stiff game ever. I'm serious! Probably the only intense bits would be the boss battles and the Hyrule Castle Courtyard bit.