There are many places to stay on Samui. Chaweng Beach is the biggest resort offering the most accommodations (it is also the piciest). This is the place for those who want to be in the thick of the action with everthing from McDonald's to Thai boxing, from go-go bars to elephant riding. It's all here. It also boasts one of the best beaches on the island. What started off as a dusty strip with a few bungalows on the beach is now a booming holiday metropolis.
Lamai Beach is a little quieter but is more renowned for it's traveler and and bar scene. Accommodation here is a little cheaper with may beach bungalows to choose from.
Quieter destinations around the island include Maenam and Bophut on the north coast where the emphasis on "getting away from it all" is greatest. There is a lot of accommodation along these two pretty coves but nothing in the way of any nightlife or extensive choice of restaurants.
In all places, visitors can choose from bungalows, hotels and resorts. Reservation are necessary during the high seasons.