Let me tell you about our new favorite game that both of us are wholeheartedly in lust with, and if it weren't for having to erase the board with water and feeling wasteful, we'd play all day long every day.
To play, you'll need a flying disc (or several, depending on whether or not you feel like retrieving) and something to draw or make a big tic-tac-toe board with--and so, naturally, a big place to make it as well. Chalk on a driveway or a quiet street works best, but you could also lay sticks down to make a board in a field. Then, instead of playing by selecting where you'll put your X's and your opponent will put his or her O's, the twist comes in when you have to toss the Frisbee onto the board to be able claim spots on the board. Perhaps you'll want to mark a line designating where both players must stand behind to throw the Frisbee(s), to make it fair.
I suppose you could play strictly giving each player one chance to toss the Frisbee and if it doesn't even make it on the board, it still counts, but Silkworm and I played so we each got as many turns as we needed to get our Frisbee on the board in an empty spot--not necessarily in the spots we wanted them to land, but at least so we could mark an X or an O somewhere on every turn. We also drew our boxes quite big for lots of landing space, which worked better than I expected!
When you finish the first round, have a hose nearby to clean off the board.
If you're a great Frisbee thrower, this is your kind of game, and if you think otherwise, let me let you in on a little secret. Once upon a time, my mom went to a dog Frisbee workshop seminar-y thingy and learned from a professional how to throw a Frisbee. It doesn't matter too much how you grip it, but when you're throwing it, try standing with your dominant hand's side of your body turned to your target. Stand with your legs wide apart and both arms out straight--just like a starfish--and when you're ready to hit that bull's-eye, curl the arm of the hand holding the Frisbee into your chest, and then flick your arm out, letting go of the Frisbee at the very moment your arm is directly straight in front of you, but without stopping the motion of your arm and letting it continue until it's back at the side of your body it originates from.
Tell us if you play, and please send us photos if you take any!