How to Play: Get yourself a regulation Wiffle ball and bat, and find a stretch of green grass. Set up some bases (if pressed for objects, we recommend flip-flops or towels), assemble some teams, and get it going. Wiffle ball follows traditional baseball rules, though feel free to decide how fast the pitching should be. Underhand usually allows for a little more fun.
Why It's Awesome: Wiffle ball reminds Americans why baseball was ever the national pastime to begin with. It's relatively easy to put the ball in play, (assuming the pitcher doesn't think he's Roger Clemens circa 1992), and you can play with a large group of people. Mix in some infield chatter, maybe some sunflower seeds if you're feeling adventurous, and you're all set.