There's a small mountain with a big cave. About a million bats living in it. At sunset they all flying out for hunting. It can be seen from a roof terasse at the bottom of the mountain. the bats fly out in a big wave or spiral depending on the wind moving beautifully like a swarm. Outside they are awaited by predatory birds trying to catch single ones….the spectacle lasts 10 -15min and begins around 20-30 minutes before sunset. the location is about 30 km north from Hua Hin near by Cha Am: you drive the Thanon Phetkasem Road in direction north then turn right into the road 3174, than the first right and following the road about 1,5 km. on the right side there is a single house in google maps it says bats view point.