[sting]

from bangkok by car you can take a taxi or Limo transfer 2-3 hours to Hua Hin. i think 1500-2000 bath
Another option is flying. Bangkok Airways fly daily from Bangkok to Hua Hin. Departure time is 8am, arrival time is 8.40am, the regular fare is 1.500 THB (one way). But as you will have to get to the airport in Bangkok first and to downtown Hua Hin later, this option won’t save you any time or money against a taxi-ride. And it’s far less flexible because you have to stick to Bangkok Airways schedule, which very well might be different from your own one
Flights operate from Hua Hin to Koh Samui with connections to Phuket .

OBS: i dont now the latest uppdate for this
airfield suspended commercial flight operation three years ago to extend the runway across the Hua Hin Cha Am road.but are nowFinally the airfield has re-opened but at present no commercial airlines are landing there.
Bangkok Airways were all set to resume their flights as part of their summer schedule. A one way fare of Baht 1,500 was filed with the Department of Aviation but according to a spokeswoman for the airline there has been no response from DOA and the schedule was dropped. If the fare can be agreed there is a possibility that they may fly Bangkok to Hua Hin and the onto Koh Samui and return.