My family will be in Khao Lak for 5 days in early April. My sons are completing the classroom portion of a NAUI Scuba course and will want to do their certifiaction dives there. In addition to looking for a good dive shop I am also hoping to find one with more local rates than what I've found so far in my research. Rates seem a bit more "Western" than I expected. How can I find good rates with good service in the area?