Overnight stay at Mae Ngat Somboon Chon
Fairly sure these pictures are of 'Brachythemis contaminata', there were many flying around the edge of the lake. There were also a large number of egg clutches on reeds nearby, not sure if they are from this Dragonfly.
These are eggs of Channeled Apple-Snail (Pomacea canaliculata)
Many thanks to Vivien Braznell for the identification. http://www.projectnoah.org/users/VivBraznell