Planning a trip at the end of the year. Stops in Hong Kong, Macau, Bangkok, Seam Reap and Khao Lak. Figure we'll be "templed out" by Seam Reap and balance of the trip will be beaches, sailing and snorkeling. Can't decide if our last stop should be Ko Samui or Phuket. Phuket would be easier due to its proximity to Khao Lak and airport, but I'm wary of the redundancy of two areas so close together especially since most of the snorkeling trips in both areas go to the same places. Is Ko Samui different enough to warrant the additional transportation costs (about $300 pp) and hotel (J.W. Marriott Khao Lak vs Renaissance Ko Samui.
All advice would be appreciated!