Mai Pen Rai is'nt just a common saying on Koh Phangan, Maipenrai is as well the name of a popular place here.
Booking a bungalow in advance for events suchlike New Year or full moon party week can be useful. Places suchlike Milky Bay or Sarikantang Phangan offer homepages together with booking services.
If you want to go to dive in and around the Andaman, the numerous tour operators can make sure you get there safe. There are many companies which will take you forth and back everyday and all day long.