1. Most secondary roads are very narrow and perennially rutted, while access tracks down to beaches can be steep. As such, choose your rental car carefully: a powerful but reasonably slim 4WD is best if you plan to really be intrepid.
2. Mountain roads can easily become foggy – check weather conditions before setting off.
3. There are limited 24-hour petrol stations on the island, so always refill the tank before going on a late-night trip.