Uou can always rent a private taxi for about $60 USD one way and if you are a family, why not do that? Any hotel in Bangkok will help you make those arrangements, but some hotels might mark up to 2,500 baht or $75 USD. For the rest of us single folks or couples, a mini van is your best option. The price tag is only 180 baht per person, not even $6USD, a good deal by any measure. We took the train to Hua Hin from Hua Lamphong train Station in BKK and we took the mini van back from Hua Hin to BKK.
How to do this?
In Bangkok, take the MRT (subway) to the last MRT stop called Hua Lamphong. Here you exit the subway and walk underground and connect with the Thai Rail Station also called the Hua Lamphong Train Station. You can buy a 3rd class train ticket for 150 baht ($4.50USD). The trains can be busy so you probably need to buy your ticket a day or 2 in advance. 3rd class has no air conditioning and we didn’t need it, the windows were down the whole way there with a gentle breeze coming in. Or you can buy a 2nd class ticket for 550 baht ($16USD) and travel in comfort on a slightly faster train.
Train Departures from Bangkok to Hua Hin: 8:00 am, 9:20. 1:00, 2:45, 3:10, 3:35, 4:40, 5:05, 5:35, 6:05, 6:30, 7:30 and 10:50 pm.
One thing about trains, they can be slow. Trips times vary depending on the departure time. Some trains run in under 4 hours, others are more like 5 hours, 30 minutes. So you can ask this when you are booking.
Mini Vans are fast, inexpensive and convenient. In Bangkok you catch the mini vans at the Victory Monument BTS Skytrain Station (see picture below). The Vans hold about 9 people and travel times are under 3 hours. Departures are numerous throughout the day.
In Hua Hin, the train station and the mini van station are close to each other, a few blocks apart. The big difference here is that you cannot miss the train station as these pictures show, but the mini van station is just like your basic corner store. Just look for the “clock tower” in Hua Hin, you will see a tourist information desk here and they will show you how to find the mini van station. It’s not hard, just a few blocks walk from the clock tower.