sunburns! status effect for people who wear their swimsuits WAY too much (I will fit in this category)
many many minigames
goldfish in a bag
fireworks, loud dangerous ones. and even ones that can be used to attack enemies, with some clever placement. (and its never too early to start thinking about airriders)
juicebar and ice cream vendor npcs in town, or whatever the Eorzean equivalent is
dunk-a-pool minigame, for those of us who have professionally honed our stone throw abilities, and want to show it off to our friends by dunking them into a giant pool of water
perhaps I am now breaching into the realm of unrealistic, my real suggestion is to implement it right now! it is 97 out as i type thisI work in this heat, I need an escape and fast. save me Yoshi-P, you have the power