Wow, this might be the toughest question I've had to answer since I took my college admission tests.
So tough! All lands are absolute excellent for their own reasons:
Adventureland - POTC, love the pirates training too.
Tomorrowland - Mr. Morrow, Mr Tom Morrow. Space Mountain rocks! The TTA! Really miss Alien Encounter though. If they brought that back, TL would be my absolutel favorite.
Frontierland - with Splash Mountain and Big Thunder MR, how could you go wrong.
Mainstreet - For reasons already mentioned.... just the feeling of bliss and like you're finally home again.... for 7 more days.
I had to vote for
Liberty Square though. I'm really into early American history. I love the Hall of Presidents, and the Harbour House!! I eat at the Harbour House every time I'm at the MK. But most of all, I had to vote for this land because of my favorite ride. I could ride on the Haunted Mansion for 12 hrs straight assuming there were no lines.
Man, really the toughest question I've had to answer in some time.