We very recently joined a trip to Raja Yai - and were dissappointed to see mebers of the ship's crew throw food garbage overboard into the sea. Not only is this contrary to the UN's MARPOL guidelines but shows a disregard for the marine environment. The wonderful eco-systems around Phuket are severely stressed by the volume of tourists. One expects that tour-operators demonstrate a sensitivity to this issue.
Having registered this concern, the crew were friendly and the facilities on-board were good, with proper safety briefings