It's always difficult when you have tight dates and a specific destination in mind, and I have only two boats with trips during that period out of Phuket. One offers a 4d/4n/14 dive trip from Dec 28-Jan 1 @ THB 24,000. If you are departing on the 1st, this boat may not work well for you since it arrives back at Phuket at about 5 pm, and of course you can't dive for 18 hours before your flight, so even if you can make a late flight, you would risk missing the fourth day of diving all together. The other boat offers a 2d/1n/7 dive trip to Hin Daeng leaving out of Phuket on Dec 28 and returning on Dec 29 @ THB 12,000. If you're interested, let me know and I'll check availability.