A few things I would like added for the Golden Saucer Release. let me know if anyone else has ideas as well..

Special Currency: Golden Coins
Bgs (and betting)
24x24 battlegrounds, simulated and player instanced. allowing noncombatants to place bets on the outcome. (winning team gets .5x golden coins/.5x wolf den token) (bets give 1x golden coins depending on bets)

Chocobo Racing: (isn't this everyone's hope?) Betting on random chocobo's for various tracks. (allowed to race Chocobo upon Chocobo Breeding in 2.3+) (prize 1.5x golden coins

Battle Arena: You and Chocobo vs various mobs. instanced on Ilvl and Chocobo Rank. (2x choco exp rate) (1x golden coins)

Specialized vendors:
Chocobo food:
Sweet food: increases potency of Chocobo healing abilities
Protein food: Increases Potency of Chocobo Tanking Abilities
Spicy food: Increases Potency of Choco DPS Abilities

Vanity shop:
pets, armor, ect.