One of the coolest things to do in Koh Tao is not on the island itself. Just a couple 100 meters from the shore there are 3 little islands connected by a strip of sand.
This unique scenery is considered to be one of the most stunning archipelagos around the world and is often published in books and postcards.
Of course the perfect white sand beach is adorable and snorkelling is beautiful, but it is the viewpoint that makes this place among the best things to do on Koh Tao. It is an easy hike up, mainly stairs, to the hilltop to get that one picture everyone comes to the island for.
