some what of a suggestion (not sure how much more map space you have to use here) but i like the minigame idea, but also another idea since you have a save code feature:
you could have another map meant for pvp arenas kinda like a battleground in wow, you would be able to do alot and expand it quite a bit there. so you would have your standard RPG world (pve) and then your pvp world in another map you could do quite alot there not sure if you would want to implement the races there or not (i would think most people would?) this same idea could also be implemented if you ever wanted to make another "expansion pack" or even possibly implement dungeon type things as mentioned by others?