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Lawnmower racing
Irishman Jim Gavin first came up with the idea to take part in a lawnmower race. While this was for ride-on mowers, you could opt for a cordless handheld model and either time how quickly participants mow a strip of lawn or invite neighbors around with their mowers and set out a course. Whoever reaches the end of the course first is the winner -- the benefit is somebody gets their yard mowed for free, although it might not be very fair, This is for the older kids and adults in the family.

© Holger Eckert | CC BY-SA 3.0