We continued north enjoying short hops from one white sand beach, limestone cliff and lush jungle to the next. We've reached paradise. Koh Rok Nok, Koh Kraden, Koh Muk and Koh Phi Phi were all on the schedule.
Our favourite was Emerald Cave. This involved donning snorkel gear (for Simon anyway - I used the kayak) and swimming through a tunnel for about 500m. The tunnel was pitch black and had a number of offshoots where we managed to get a bit lost. The roar of the ocean, the surge and overhangs made it quite exciting in the dark. We spotted some light at the end of the tunnel and swam into a crystal clear lagoon with a white sand beach surrounded on all sides by steep limestone cliffs covered in green ferns. The emerald glow that was cast made it live up to it's name. A few minutes after we arrived, the tour boats left and we had the place to ourselves!