This would be cool as one minigame, not multiple. Too much work to design it with minimal expansions of interest. The Summer Waterpark is the best you'll find. I still think Era should have a Casino, but no betting themes. Just have card games and slot machines, but no gralats involved. Maybe instead you earn random items (like the mini quests, like snowmen or the grass creatures. Whatever.) Or you earn vouchers for X amount of random items.