The Zip line in discovery park is 300 metres and quiet slow. It's good fun for a thrill seeker but not so dangerous that the average visitor would be put off. You will have an option to also take on an obstacle course which is enjoyable but also quiet challenging physically . It's a great days activity and at €25 for both activities or €15 for just the zip line it's also good value. It's not advisable to go with small kids, I wouldn't imagine they would let anyone under 12 sign up for this but you know your kids and the best way to know for sure is to contact the park directly . We called in for a coffee to the cafe in main reception when we were done. It's good value for money read more