Yesterday we bought a small kite and went kite-flying on the beach. We'll keep it and do a bit more later in the tour when the wind is up.
Today we got a frisbee and had some more fun on the beach. It'll go in our kit for some impromptu outings later in our travels.
The French seem to love a game involving oversized table tennis bats with a hard ball, and just hitting it back and forth. So we'll do that tomorrow.
And a British couple on a tandem brought along a pair of badminton racquets and shuttlecock. We won't go that far, what with the other ball game just mentioned.
This is all activity that involves stuff that is reasonably light, although not necessarily compact, that can be toted along on a touring bike, and can involve couples or simply guys or girls on their own without needing any special venues or facilities.
Maybe this is more a European things. Maybe not.
What other physically active pursuits do you engage in on tour (keep it clean, please)? Do you carry anything in your panniers like a frisbee or just a plain ball?