I love FFIII's world because it has a map within a map (as well as an underwater map), and all of them are positively riddled with secret mini-dungeons, hidden villages, byways for various vehicles, submarine passageways, and all the other things that make exploring its own reward.

I like FFIX's map for similar reasons, and especially for its use of three-dimensional topography. I love how Dali is seated on a cliffside, for example, as well as all the nameless, miscellaneous valleys and island chains you happen to navigate while filling out the extended Chocobo side-quest. There's something interesting everywhere--even in the middle of the ocean.

I admire FFV for its two separate worlds, and how their layouts are affected when they merge. Previously unaccessible locations now lie out in the open, whereas others that could formerly be reached with a jaunt through the forest are now ensconced within winding mountains and harsh deserts. I also like how the mountains in Galuf's world serve as a throwback to the white crags in FFI and II, as opposed to the brown conical mountains found in FFIII and onward. Just check it.