Hi
did windsurfing on Kos and at Vassiliki and Nidri and Porto Heli. On no wind days hired a dirt motorbike (also did guided motobike holiday on Crete) and had a fab time – mainly cart trails, some sheperd paths, but near Vassiliki on coast there was some tighter stuff. Locals attitude was great, (I always slowed down and tried to talk), lots of help given , directions etc, places to visit, some great scenery and history too.
Maps are unobtainable or CRAP.
Beware power and water cables strung at chest/head height across roads near farms/fruit trees/olive groves etc. Also had a run in with a pack of wild dogs on one desolate road.
Do NOT photograph or go near military installations (Kos is near Turkey) as they get upset about that a lot quickly.
I used follow my nose and head away from areas of population and it alwsy worked – but to be fair a bit easier on a motorbike ( I was doing 200 miles some days)