A zip line is such a great outdoor toy for girls and boys age 5-12. It’ll be a treat to see the looks on your grandkids’ faces when they first master “the ride,” and how they’ll continue to enjoy it for years to come. Zip lines build strength, coordination and self-esteem, and they’re a great group activity. The steel stranded aircraft cable of the Fun Ride Zip Line requires 2 sturdy trees or other supportive structures — the trolly ride is 35 ft. long. The Fun Ride kids zip line kit comes with the hardware and instructions required for its easy assembly. Amazon.com also sells a Fun Ride model for older kids and adults, with a weight limit of 225 lbs.