It is one of the very touristy places in Koh Samui, there are almost always a lot of people except early morning. But besides the shapes of the rocks, the setting is really beautiful so if you can, make it at least a quick stop here.
Just above Hin Ta Hin Yai, there is the Lamai Viewpoint that many people miss and it is a pity. The view is more dominant and you can see on both sides with on the left an unobstructed view over Lamai beach and on the right Hin Ta Hin Yai and Hua Thanon beach. THe viewpoint can be reached by a small staircase behind the toilets.
Visits from 6am to 7pm
If you do't have your own transportation, you can visit these iconic rocks of Koh Samui using songthaews (collective taxis) that circulate on the island. You have to negotiate the price before you go in. Otherwise, this stop is on the program of many of the tours of the island.