There is one main road running North to South on the island with many smaller roads diverting off it. Some roads lead over the spine of small mountains that run along the middle of the island and are all dirt, can close out after rain, and can be challenging even to a skilled driver. There are usually plenty of taxi cars available on both Sairee village and Mae Haad, however they tend to be expensive given the actual distance you travel.
You can rent bicycles and motorcycles at a few places on Sairee Beach, Mae Haad, and Chalok. Be careful if you rent a motorbike as the dirt roads can get dangerous. ATV's (all terrain vehicles) are dangerous (ask any medical clinic) and expensive (500+ THB a day) and should be avoided in favor of Honda Dream's (150-200 THB a day) or Sonic's (200-250 THB a day).
Be aware that an increasing number of rental shops are charging large amounts of money for non-existent scratches on bikes when returning them, notably the shop next to 7/11 in Sairee (Save way travel). Make sure you note down all scratches and dents before you rent a bike from anyone.
If you want rent a Bike and be sure to not charged for scratches go to the shop opposite all4diving (near dolce vita) this is an honest shop!
Longtail boats offer rides to and from certain beaches on the island. They are a more comfortable way of getting to isolated beaches than attempting to ride over the mountains. Round island longtail 500-700 baht, short trips 100-200 baht.
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Based on a work at Wikitravel.org & Traveldudes.org.