You can fly from Bangkok International Airport to Hua Hin and then taxi to Pranburi. Hua hin Airport to Pranburi hotels and resorts journey time varies from about 40 to 50 minutes on average.
Travel by taxi or limousine from Bangkok, jouney time varies, 3 to 4 hours.
Express bus to Hua Hin about 3 hrs 20 minutes and then taxi to pranburi beach area about 30-40 minutes.
Train from Bangkok to Hua Hin is about 4 to 4 and a half hours, then taxi to Pranburi.
Getting to your hotel by hotel car should cost you around B3500 one way including petrol and toll charges. Pattawia picked us up in a Toyota Camry from Suwannaphum Airport and the journey took about 3 hours including rest stops. I think that price is OK given the rising petrol prices and long distance. Have not taken the bus, so can't comment on that.
Pran Buri is abit out of the way so it helps having your own car. If not, most hotels have some form of shuttle van to and from Hua Hin town, but it might not be free - depending on your hotel.