Bus (from the Southern Bus Terminal)
Hua Hin Pran Tour (02-884-6192) operates air-conditioned buses which leave for Hua Hin starting from 4am, after which they depart regularly at 40-minute intervals until 10:20pm.
To get back to Bangkok go to Hua Hin Air-Conditioned Bus Station (032-511-654, 032-512-543). The first bus departs at 3am and after that every 40 minutes until 9pm.