It's about 1.30 hours non stop driving. However, there are a few nice stops along the way like Sam Roi Yot national park, Pranburi, Ao Manao etc. I would plan a day trip and leave in the morning making the stops along the way and drive directly back after you're done.

Quick information for Hua Hin: For HH exploring Sam Roi Yod national park on bikes would be fun. http://www.dnp.go.th/parkreserve/asp...sp?npid=8&lg=2

Go to the Phraya Nakhon Cave while in the park, take about 1/2 a day by a combination of boat and trekking(biking) and do the Khao Daeng Canal cruise. All very inexpensive and beautiful. Another place that I like to visit for lunch and relaxation is a local vineyard own by the owners of Red Bull drinks. http://www.huahinhillsvineyard.com/

From Friday night to Sunday night there's a wonderful night market call Cicada market. http://www.cicadamarket.com/photo

Restaurant etc. Let's wait until it's closer to your travel and I'll give you a list of what I like in town.

Thanks so much! You are so helpful and such a great resource.