The best option is the bus if time is not a constraint. It's a direct route offering relative convenience, though it may take a considerable amount of time.
Traveling from Hua Hin to Ao Nang involves a 360-minute bus ride. This is the only option currently available, making it a suitable choice if travel time isn't a concern. Be aware of the price range, which varies between 450 and 900 THB.
The bus is also the cheapest option, with prices ranging from 450 to 900 THB. Keep in mind the long travel duration.
For families seeking a comfortable trip, the bus can be suitable if children can handle a long ride. Ensure to bring additional comforts like snacks and games.