We do take them to the local park as well. I promise I won't let them ride into anyone's tent. They have no confidence at all at the moment so they're barely riding anyway. And this is with stabilisers.
Clumber Park looks fantastic - I will definitely think about going. It's about 4 hours away from us but I think it would be worth the drive.
Holmsley's quite close so we'll probably go there first.