The beach here is easiest reached by boat.
Another option to get to Anse La roche is a hike through the national park.
On some days there can be a swell which makes boarding and unboarding difficult, so choose a calm day to get here.
Video of Anse La Roche beach.
In the video below you will see what can happen if you anchor your dinghy too close to shore. A freak wave flips the dinghy over, not nice at all.