Hi Jon and Yiasmin - welcome to HT!
I have had a look for you and can only find general maps of the area( which you've probably found already!) Just in case- have a look here and here. Both sites also seem to have good information on them.
We also had someone else asking about your hotel here.
Is this part of a tour you are doing in Thailand?

Hi Fiona - Thankyou for your quick response to our post and the links to local maps. I was advised by a work colleague to take a look at your holiday forum and we have found it very informative. It's our first time in Thailand and we will be staying in the one location (Khao Lak) maybe branching out on future visits. We have recently contacted the Hotel for further details and be assured reports / links and pictures will be available as soon as possible - Regards Jon and Yas

so are you into snorkelling?
Why not also ask your hotel for any trips/excursions they do?
I wonder if anyone here can help with suggestions?