An Outdoor Baseball Game
Shoot to score seats in the shade, but if not, pack a spray bottle to spritz yourself and duck into the AC (or under a roof) every half hour or so.
Pick foods high in water content (hey there, watermelon!), stay away from the heat of the grill and fill a cup with ice to press on your pulse points.
A Pool Party
Take a dip— you're better off in the cool water than on the toasty deck. Drink plenty of H20 and occasionally grab a bev that has electrolytes, like coconut water or a sports drink, to replenish everything you're sweating out.