Where to go off road with my Quad

I have my own Suzuki 500 and would appreciate your guidance on good places that I can go roaming in Malaga.. Mountain roads ..
Are there any national parks where quads are allowed?
Any guidance will help
Another question is.. The trailer I use to carry the quad.. Does it need a registration certificate..?
It was manufactured in uk I think
Any help will be appreciated
Enjoy the sun
Willie

Another question
Are there any quadbike clubs in Malaga
Bill

If you don't have any papers for the trailer, i.e. the ficha tecnica, ( log book detailing length,width, height, axles, tyres, everything ) then it is not legal. 500€ on the spot fine for no papers, if stopped.

According to our Policia Local, you can only legally drive off road on private property, there has been fines handed out here for riding on quads on mountain roads up to 2000 euro