The Dead Dunes for sure. Something about a big desert that I really like.
I liked the atmosphere there and there were plenty of enemies to fight (with Fang!) and kill.
I also loved exploring the ruins and collecting lots of treasures along the way too.
The bandit camp and that little cantina was quite awesome too. Lightning fit right in.
It was a good and relaxed atmosphere, a place to get lazy in and get a good sun tan. LOL.

The Dead Dunes is a quiet and peaceful place. Good and relaxing.
A place to unwind. Except it is home to many beasts and Aeronite.
Oh well. The bandit camp will do.