Martin Reij writes:
Hi Paul,
Is it taken from the coast of Phuket looking at the limestone caverns of Phang Nga Bay? Did you take the canoe ride?

Which is of course the right answer. This photo taken from a floating Muslim fishing village, built on rafts. I was travelling with a German girl at the time who thought it would be "cute" to spend the night there. How wrong she was. And yes I did take the canoe ride!