I Got Your Back: To prepare, use duct tape to attach three 6-inch strips of white crepe paper to the back of each player's shirt. Give each kid a spray bottle, then let the squirting begin. Whoever has the most remaining paper once the water runs out is the winner.
Tug of War is about as basic a game as there is. You just need a long rope and bandana or piece of cloth to mark the center. Organize your teams by family or do a boys vs. girls. Pride is on the line and tug-of-war games can get heated but remember it's all about having fun. Do a best of three to determine a true winner.