Crafting Hall:
Crafting turn in (similar to GC)
various Vendors allowing you to buy special recipes for each crafting class.

Arena Hunter: (Daily Quest)
allows you to buy one time permits to "Legendary" Mobs. (use item to summon when in correct zone, make sure to bring friends) (use Golden Coins to earn Golden Coins.)
Game Central:
Snowboarding: Random tracks based on "Fantasy worlds" (Cloud on snowboard from 7, Zell from 8 'I don't see Squall on a snowboard...', Zidane from 9, Tidus from 10)(Each track designed from each persons world.)

Mog's house 2: (Remember the original from 7?) new mission to make mog fly.

Slots: self explanatory

Cards: Card game from ff8, randomly obtain cards from Coil and CT, as well as .05% drop rate from mobs. (include Golden Coin Vendor) .5x golden coin for winning on basic rules. 2x-4x on random rules.

I am sure there are hundreds of other ideas. and I thank you for your time.