Jenova

You can first visit the arena gradins (bleachers), this is one of the remnants from the old base guild along Bu San vegetables stall.
Returning from the arena you can take a little path on the right which will lead you to a zen area: with a small cavern, floating park, and leisure with view on the lake.
Going further you can see the magnificient theater with behind the scenes.
Don't forget to grab a meal at the restaurant and try the kitchens.
For the naughtyones a jail is at your disposal.
Hidden path if you go to hell find the secret base