Every summer our cub scout troop hosts a vegetable regatta. With three young boys, it is something they look forward to and talk about as the garden is growing - making sure we allow some things to get large enough. We gather large garden produce such as zucchini, yellow squash, and cucumbers and meet at the park where skewers and construction paper are provided. Then the boys set to work carving them into boats. The skewers provide stability and the paper is fun to add a sail. Each boat is unique in design. We then send them racing off down an irrigation ditch in one of our local parks. Dads with fishing nets are ready to catch them at the end and then the boys race them off again.
Here is my son, Ben's, design. He was so proud of it that he had to bring it home and show it off for a few days.
You could easily do this with a group of friends or for a family reunion. It's nearly free fun and one more reason to grow a garden!