The Whitehouse Resort in Laem Sing was a friend's recommendation and it exceeded my expectations by far! The resort itself is small but full of lovely details and run with utmost care and love by its owner Kamon. All bungalows are just some steps away from the beach and in perfect shape and condition. Everything was super clean and in order. There was a small breakfast every morning, you can rent a bike or a motorbike, you can go kayaking, just relax in one of the hammocks in front of every bungalow etc. They even have a small swimming pool which is also very clean and a good refreshment. Also the wifi was working perfectly.
The owner Kamon and his family take care of the guests, are always available and try to make your stay as comfortable as possible. Kamon even drove me around and showed me some lovely spots in Laem Sing and the area around Chanthaburi.
The town Laem Sing is also small and not at all touristic. But you'll find some good restaurants for seafood and a nice pub run by a British guy. So if you're looking for a place at the beach without hundreds of tourists, you should come to Laem Sing and stay at Whitehouse Resort. It truly was one of the best beach resorts I ever stayed in.