A note on Katoey aka Sao Song aka Sao prapet song (literally mean second type of women). Usually written as สาวสอง or just สาว2.
Most of them operate in groups of between 10-15. There are also smaller groups of 2-3 and they hang around the darker sections along the beach. Usually they will blend in with the real working ladies so the unsuspecting tourist think they are working ladies. Some of the gangs can be very violent and even extort money from the working ladies and tourist.
My neighbours have many time clashes with the katoey gangs in jomtien beach until the local pai kia in charge of the area place a curfew for both sides.
Even the matas and local pai kia also shake their head when it comes to katoeys gangs operating at the beach.
For those tourist who are alone, my advice is dont ever go to the beach (both Jomtien and Pattaya) after 10 pm. There are many joints to have fun and safety is gurantee by the joints.