Amazing place, but motorbikes are going to be an issue I was up there the otherday and some lads were going round the wrong way on a motorbike.
They need to do somthing about it before someone gets hurt, possibly look at building something they can use, or someone patrolling the area and stopping them and introducing them to mtbing. Get them to hire a bike so they can use it for what it was built for and they fill find it will be more fun get them involved.