Khao Lak is a wonderful Thailand beach. Just a short drive from the airport, this paradise offers a remote vacation area like no other. Thanks to the area being largely uninhabited, there is lush rain forest nearby along with a whole host of wildlife to be viewed. The water remains warm in the November through December months and the fishing and scuba diving is out of this world.
Phuket Thailand Beach is another great spot. Enjoy this resort November through March. There is more than enough to do. It is a bit more crowded than other beaches as this area thrives on the tourism dollars that it brings in. The scuba diving is top notch in this area and you will also find some of the warmest most clear water in the world. There are several nearby attractions to keep one busy for quite a few days.
West Raily Thailand beach is one of the undiscovered diamonds in the rough. There is very little that is expensive here and one can stay at the "resort" for over a week and barely tap the budget. The sands are milky white and the water clear. Scuba diving is very popular here as well as the fishing. This location is only accessible by long tail boat so plan for a bit of a long ride.