Recently I had a go on a quad bike and its really fun. I am looking to get one. It doesn't need to be roadworthy and I don't want one that looks like a 2 year old had some crayons and went ham.
I've been on a few quad and my favourite was a Quadzilla 450 it was a monster. Also you will need private land to ride around on your quad unless you have the confidence to smoke the police every time you go out