The easiest way to alleviate the rush would be to open starting city Chocobo Racing counter. You do not have to be in Gold Saucer to do racing but you can still race with ANY other participants from all other four zones. Which is what FFXI did. This way you split the crowds into 4 zones. As well as add special "city casino" and put those triple triad NPC on another three other zones, each cities will have their own NPCs in a special zone with their exclusive rare cards to have. The crowds will disperse fast since you only do the other mini games and active time events on Gold Saucer and the weekly - daily lottery. The other two major attractions split into three other zones.