Ao Wai Beach is a white sand seashore with crystal clear water located to the south of Koh. It doesn't have much tumult, so it allows for a more peaceful experience of the Thai seaside. Samed Villa Resort serves some of the best food, with excellent bed and breakfast options, which is at a walking distance from the beach. Another one is Koh Wai beach resort, which is an average place to stay. Some small restaurants include Apache Pier, Jellyfish, Koh Wai Paradise, Good feelings etc. If you're looking for some vibrant Thai nightlife, this isn't the right place.
Ao Phrao Beach is one of the most isolated beaches which is located to the Northern side of Koh Samet. It has a relatively more extended seashore and offers more resorts than Ao Wai. Buzz is a small restaurant that is famous for soft shell crabs and salads. Korkut Ao Phrao Beach Resort, The Sunshine Resort, Lima Coco Resort and Le Vimarn Cottages are good places to spend the night. You'll find coconut and rubber plantations by the shore. The grey sands and low tides, even in peak season, make this a perfect beach for swimming and kids.
Ao Wong Duean Beach is a fairly busier beach than others and offers a broader range of restaurants. You'll also find small sellers of fruits, drinks and snacks. The la luna Cafe n Bar and Baywatch shacks are famous for cocktails, mojitos and seafood. You'll find many ferries by the shore. This is the best beach to do water sports like snorkelling etc. The Samed Cabana Resort is the best hotel at this beach. Other options to spend the night are bamboo cottages (500 Bahts approx.) or some 7-8 other small and cheap resorts. You can also get massages here at just 300-400 Bahts/hr.
Ao Cho is a beautiful beach that is shaped like a crescent. It's the ideal place for a relaxing sunbathe and swim due to its low calm tides all year round. The freedom bar here is really cosy and chill as it makes the best cocktails here and allows you to play your own music. The Lung Wung Bar makes lip-smacking seafood and offers comfortable beach beds with umbrellas. The Ao Cho Grandview Hideaway Resort is rated the best here. This is an excellent beach to do snorkelling as its shores are home to turtles, fishes and sharks which are worth exploring.
Ao Nuan is a rocky beach with pretty strong waves but is again quiet and tranquil. The Noina's Mystic Mountain Resort and Bungalow serves excellent seafood and have comfy treehouse rooms for the night. The seaside is covered with immense greenery and nature. Due to its low level of activity and quietness, you might feel lonely here, but if that's something that doesn't bother you, then this is a good stop for a while.
Tubitim stretches to about a shoreline of just 200 metres but is more popular than other beaches in Koh Samet, and its speciality is that it offers cheap bungalows and hotels. This beach for some unknown reason attracts many gay couples and has been informally titled as 'the gay beach'. It is rocky and has sliver-ish sand on its shore. You wouldn't find any speedboats or jetskis here. Nevertheless, it's an excellent place to swim, sunbathe and do snorkelling. The Tubitim restaurant offers some delicious food, pork ribs being a 'must try', served by a friendly staff. The black pearl cafe serves fantastic coffee and wooden chairs to chill by the shore sipping some latte. Some good bed n breakfast places here are Sabed Tubitim Resort and Pudsa Bungalow.
Ao Noi Na Beach beach is on the northern tip of the island. This too is a serene and calm beach. If you're looking for some nightlife or shopping hubs, then head to Sai Keaw beach instead. You can enjoy the white sandy shore, collect seashells, read a book and order some mocktails from Mooban Talay Resort. You'll experience many new species of underwater creatures and coral reefs by snorkelling here. Noi Na has only one major place to spend the night, and that is Mooban Talay Resort, which is said to be the most romantic hotel in Koh and costs around 6800-7500 INR per night. Other nearby resorts are Samed cliff resort, Baan Rom Talay etc.
Also known as Haad Sai Kaew, Sai Kaew Beach is located towards northern Phuket Island. It is one of the very developed beaches and hence subject to mass tourism. One will find umpteen restaurants along with with a lively nightlife scene, loud music, and a good crowd as well. Besides these, Sai Kaew Beach is also famous for plenty of water sports like water skiing, jet-skiing, banana boating, canoeing, wakeboarding, and scuba diving.