The Oyster Blade 

The guidebook recommends telling a boatman you want to go to Ao Ling (Monkey Bay) this will likely get you taken to Hin Tak. This is further problematic that Hin Tak is the word for broken rock and the boatman may understand where you want to go and say Hin Tak (broken rock) which is a fair description of the Oyster Blade. The best way to get where you want is if you stand on the pier at shore, directly above the lamp posts is the Oyster Blade. If you get a boatman to come stand at the pier and say "Lamp post Hin Tak" you will probably get where you want. We paid 100 baht each/each way. This is probably twice the price we should have paid and we could have walked back instead of getting picked up but in the end it worked out for us and we had a great day of climbing and the boatman made an extra $5 each way.