It would probably be just a dressed up Disney/Butlins (maybe filey)
A monorail, gotta gotta have a long big Monorail, In ff7 styled train.
Chalets/Apartments, decorated well and placed in greenery and trees, maybe with murials, and built in a ff6/5 home style as well as a hotel in ff6/9 castle style.
Rexlaing areas like a "Balamb Garden" A huge garden green, maybe a sunken level with funny statues, lights and monster statues, and a fountian in the center.
Recreations of whole places from the series, such as... um... chocobo ranch, and um... Kalm town from ff7 as a shopping area.
Huge Rollercosters, dressed up as the various monsters, the zolom and such, jesters dressed as Zorn and Thorn to creep people out.
A huge indoor aquapark/pool, created to look like an FF beach, cave area, and give it a FF name. Mini-railways and road trains, made to look like trains from ff6 or ff8, imprinted with the Midgar Line.

How could I forget, pipe in twee ff music in each era, diffrent in each area and changes track every so often.