better than chopper type bikes ,but have done that too . Offroad bikes or pickups have no problems.
One drives trough rubber plantations and finally near the summit ot the mountain range through extended forrest plantations , very nice and recommendable . I do this drive at least once a month.Bonus is ,that there are restaurants up there with beer etc ,to give you something to look forward to whilst driving . Also one can rent tents and sleeping bags cheaply up there . However do not go on a weekend ,unless you plan on sharing the place with hundreds of partying teenagers. During the week the place is mostly deserted.