The resort town of Hua Hin is abundant in fresh seafood especially in the vicinity of Hua Hin pier. Most hotels serve Thai and Western cuisine including barbecue. Hua Hin Night Market on Decha Nuchit Road offers a wide array of foods.
Thai food, seafood,Thai desserts, etc. The adjacent Chatchai Market is an old famous daytime market built in the reign of King Rama VII (1925-1935) which now becomes a centre of souvenirs, and fresh & dried food.
A new restaurant appears in Hua Hin on average every couple of weeks so it could be fair to say the place is undergoing a culinary expansion! There are a number of good Italian restaurants and pizzeria's around town such as LoStivale, La Villa and Pizza Corner (not to mention Pizza Hut, which is called The Pizza Company here). There are many restaurants that cater for French, German and Scandinavian tastes, all located within a square kilometer.
For variety head to Satukarn Square (at the main crossroads) which has every kind of eatery from seafood to ice-cream, all at good prices too. Japanese cuisine (and the best English breakfast in town) can be found at the Bamboo Hut in the Bazaar area and Buffalo Bill's does a great steak. Most of the guesthouses will do simple Thai food and western dishes. Good seafood can be found down by the fishing pier where restaurants actually extend out over the ocean.
There are many Thai restaurants in Hua Hin, some of the more authentic ones can be found along Naebkehard Road such as Sara Janes Restaurant and Baan Hua Hin Restaurant. The night market is also a good source of Thai food where there are many hawkers serving local fare for local prices. For supplies check out Hua Hin Ham & Bacon, there is also the Department Store that has most essentials for those self-catering.