I really like Sohm Al; it really feels like I'm going on an adventure, braving the trackless wilderness and so forth. Neverreap is a really pretty place to visit and I like the way you can see it in the Sea of Clouds, that lick of azure rock curling against the distant sky. Of the patch dungeons the Arboretum and Lost City HM are standouts and the last two are good as well.
On the other hand I dislike the Aery (too much purple, dull bosses) and the Vault (too much orange, humdrum scenery but cool bosses).