You were looking forward to the next dungeon?
Personally, I really didn't like the City In The Sky or whatever the heck that dungeon you're in now is. Ooccoos are freaky, I kept redoing one stupid donut-shaped room, there's a lot of backtracking, and the music will drive you insane.
Now, get past that whole dungeon, and you'll encounter some cool bosses. The eighth boss is way cool, as is the final boss. The ending doesn't suck too badly, just a little short, but one part did move me nearly to tears, as I mentioned. If the story fell to a lull for you, it'll pick up soon. You're close enough to the end, as I said, it'd be a bigger waste of time if you gave up now and your twenty-thirty hours you're probably in already are wasted because you couldn't put in another ten.
Finish it. Go go go. Next time you want to bail out of a game as awesome as any Zelda game, come up with a REAL reason.
Okay, final exams is a good reason. But Monkey Ball isn't a reason. Sure, Monkey Ball is probably fun. But it's no Zelda!