Uh... the Elban caves, I guess? Being able to become a ninja under rigorous training in underground caverns sounds cool, kinda like a constant game of flashlight tag (hide and seek in the dark).

But if I had to go anywhere to relax in a pre-ff7 era, it would have been a dwarven castle in ff4. Being able able to jump around and scream LALI-HO at people would make my day.