The train is a great way to travel if you don't mind a slow pace and many stops. It is more fun and you'll get to taste a bit of culture too.
Many of the trains arriving to Hua hin from Bangkok continue their journey further south to Prachuabkhirikhan, Chumphorn and Surat Thani. Many of them are scheduled to leave Hua Hin in the evening in order to arrive in the South in the morning, just in time to catch ferries to Koh Tao and Koh Samui.
Hua Hin Rail Station can be contacted on 0 32 511 073 .