Nai Harn

This is not really a resort town. It is a beautiful beach with just a couple of nearby hotels. Nai Harn is on the southwest corner of the island. There are a handful of restaurants and trinket shops near the beach. Other nearby attractions include two other nice little beaches, Laem Promthep viewpoint and the lagoon behind the beach.
A few hundred meters back from the beach is an area of residential properties. Nai Harn is quite a popular area for ex-pat residents and there are many local restaurants and bars serving a variety of western and Thai food.

If you want beautiful beaches, a nice hotel and a good variety of local eating options, then Nai Harn could be for you. There is little nightlife and the area is a bit remote from the rest of the island.