Koh Tao has one major concrete road which connects the north end of Sairee with Chalok Baan Kao in the south, while passing the main village Mae Haad in the middle.
There is an increasing amount of small concrete roads leading to the other beaches and bays. Everywhere else you will find more or less accessible dirt tracks, most of which will challenge even a skilled driver.
Steep trails, sharp curves, sand and grit, potholes, washed out tracks and the occasional dropping coconut demand mindful driving and fast reactions.
Vehicles in Thailand drive usually on the left, but traffic rules are often freely interpreted, speed limits are not observed and suicidal dogs prefer sleeping on the roads, which are often narrow. You must always be prepared to make room for the occasional moving or still obstacle.
Yet, it is not as bad as it seems, as long as you drive carefully and remember that an accident will hurt body and budget as well. Motorcycles can be rented from 150 B, Jeeps from 1000 B, the deposit of a passport is required.

However there are many other options of getting around:

Pick-up and Motorbike Taxis
These can be found parked in busy areas, or can be stopped at the roadside. They run from early morning until 11 p.m. Please be aware that taxi prices are not fixed and fares tend to double after darkness. To avoid mis-understandings always discuss the cost before the ride.

Boat Taxis
The colourful, traditional Long Tail Boats take you conveniently and quickly to stunning remote beaches and secluded bays. You can find them at all the main beaches, they can be chartered for a short trip or a day tour. Prices are quite consistent and reasonable:

Biking and Trekking

There are more and more mountain bikes for rent around the island, which are not only practical and cheaper than motorbikes, but will also help to protect the environment. However, to discover the real beauty of Koh Tao, travel on foot.
If you are not afraid of exercise and enjoy a bit of excitement, you will be rewarded with the experience of the rich variety of the jungle, a cool swim in a lonely bay, a fantastic view over cliffs in the surf or a spectacular panorama from a mountain top.
Naturally an excursion like this will be demanding and tiresome, so leave prepared: drinking water, sunblock, mosquito repellent, tight shoes and a hat are essential and please don't go alone, like in diving, a buddy can be a life saver and besides, it's more fun.

Warning: Walking on the main road from Mae Haad to Sairee, especially at night, can be dangerous, better use the dirt road passing the school, where is little traffic.