I'm sorry, I know you want to travel to Krabi and Hua Hin but if you go to visit the province before. You have to ride a van or taxi to Hua Hin. You could be wasting more money on the go. Because of the car , and I ask you to do the tour of the taxi driver. I suggest to you that will travel to Phuket instead. It is a beautiful place, very much like the laem phromthep I ever tell you. And easy to access.