Udom Bay is a small bay in Thung Sukhla, Sriracha, in a district that holds both a fishing community and port activity. It reads as a local beach rather than a tourist one.
What is there
Fishing boats moored in the bay and seafood restaurants along the shore, which is the actual reason people stop — to eat and sit out in the evening breeze.
About swimming
This is not a swimming beach. It sits in a working port area with boat traffic. People come for the view and the food; if swimming is the point, go elsewhere.
Late afternoon is when it is at its best, for both the light and the wind off the water.