Off roading

Hi guys. For my son's 21st, I am looking for somewhere to go offroading with him. I did it for a day in New Zealand a few years ago, but it is too far to go for a weekend.

I have seen a Yahaha day in ythe UK, but it looks a bit lame. Also found one in South Wales, but have no idea how good it would be.

I am looking for somewhere all-in, i.e. bikes and gear, either in UK or mainland europe. Downside is that he doesn't have a bike license and will be a relative novice, so it really needs to be off-road.

Has anyone had any experience here that they can recommend?

Cheers