Paknam Pran - Pran Buri
Only 30 km south of Hua Hin is a great beach and an increasing number of beach front resorts. Lot of building is going on in the area. Beach homes, resorts and small housing estates are all in progress. Not all of the resorts contribute to the view.
Pranburi is growing like crazy. High priced resorts are shoulder to shoulder -- well, almost.
Pranburi's north end is expensive with resorts like Evason and Chiva Som. The south end, Paknam Pran, is less so. So instead of turning off the road just past Hua Hin, continue on south to Pranburi.
Turn toward the sea and go about 10 km. You will see signs for Paknam Pran -- and you may be glad that you did. Beaches here have shallow water and fewer distractions than Hua Hin. Also you can take a nature walk in Pran Buri Forest Park.
From The Bangkok Post, "Pran Buri Forest Park was originally under the Royal project of H. M. Queen Sirikit. Originally, it was designated as the Pa Khlong Kao and Khlong Khoi National Forest Reserve, covering an area of 1,984 hectares, comprising of mangrove forests and the Pran Buri River running through the centre of the forest area. At present, the Royal Forest Department of Thailand has acclaimed it as a forest park covering an area of 700 hectares and is under the supervision of the Phetchaburi Forest Office. Pran Buri Forest Park possesses a white sandy beach that is shady with a 1km line of pine trees on the east of the park. Moreover, from the park, the scenery of the sea, Ko Singto, Khao Takiap and Khao Tao can be admired."
Getting to Pranburi Bus or train service will get you to Pran Buri. Then you will definitely need to use local transport. Renting a motorbike is probably your best option as the beach is about 10-15 km from Phetkasem Highway.
If you have booked a room at one of the resorts, they may pick you up transport you back to the bus or train station on departure.