I would have to say Eversong Woods. This was the starting point of one of my first characters. The look, feel and anticipation of what WoW would be for me always comes back when I enter that zone. :)
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My favorite zone is currently Uldum because I like the sort of desert/oasis sort of feel to it, it just seems right. Also I enjoyed the Indiana Jones series of quests because I am a big fan of the movies. The other quests also were pretty fun like Gnomebliteration.
Grizzly Hills. It has a nice frontier-esque feel to it, plus the sound track for the zone rocks.
Tanaris has to be the perfect place for me, I enjoy both the scenery and the enviroment, it also happens to house 3 of the most epic things in the World of Warcraft. Trolls, Pirates and SAND KITTENS! Not to mention the most awarding questing experience this game has ever given me, sadly it's changed some with Cataclysm but I really enjoyed it while leveling all my toons in this zone.
Stranglethorn Vale pre-shattering :oAlways loved the whole Jungle thing, with the hunters (Nessingwary & Co.), the wild life, the "savages", and the money-opsesed people, who cuts the jungle down.That was a true piece of heaven in my eyes.
Grizzly hills, love the pine forest and the music there.
My favorite zone has to be Felwood pre-shattering. I remember the day I turned 40 and got my land mount I explored the world, and Felwood and that damn Timbermaw Hold was the bane of my existence.
My favorite area is Feralas, with all the beauty of a forest that it has, and especially the location of Camp Mojache with its waterfall, which is my preferred village throughout the game.The old Thousand Needles is also one of my favorite areas and I'm still sad to see the current state of Free Wind Post.
Outland, love all of it. The whole fractured planet and space design.
Deepholm by far is my favorite zone. The colors they used are pretty good and looks great, But the atmosphere of the zone is what i like best. Got out of highschool went to a community college for 2 years for general studies because i didn't know what i wanted to do, but then realized i wanted to work with the Earth and and now a Geology major. This zone incorporates what im passionate for, beautiful things and well rocks. lol.
Borean Tundra. I like the D.E.H.T.A chain and like Coldarra / Murlocs too. Nothing Boring About Borean
I think Twilight Highlands has to be my favorite zone. The quest lines are pretty awesome and the environment looks wicked. I love the fight at the very end with Skullcrusher. Not to mention that place is great for mining :D
Hands down Strangelthorn Vale.. amazing music and just a very memorable zone from back in the old days, grinding the quests out when i was still a nub and everything was new and exciting!
its hard to say but all the arena's are my favorite , but the one that stands out the most to me is un'goro crater the way it once was the vast jungle and excellent wildlife was so beautiful to see it was a great honor to see it and i hope it stays a wildlife heaven its always good to see. :)