Here’s a brief run-down of Chang’s main beaches:
White Sand Beach or Hat Sai Khao Beach: A beautiful beach with a highly developed touristy infrastructure. Most popular beach and therefore busy. Restaurants, hotels, bars, shops, and nightlife. The northern end is for a quieter and more beautiful beach, the southern end is for seafood and cocktails in a deckchair without the spectacular beach.
Klong Prao Beach: Longest beach on Koh Chang. Resorts, shops, and restaurants on the northern end. Good for swimming. Possible to find a quiet spot. The northern section is busier, the southern section is to get away from people.
Kai Bae Beach: Best beach quality on the southern end. Few resorts, shops, and restaurants behind them. Quieter than White Sand Beach or Klong Prao. For families and independent travelers that don’t prefer a hotel environment.
Lonely Beach: The nice and quiet beach. Good for swimming. Backpacker scene. Restaurants, cheap accommodation, and shops further down south. Enjoy the beach by day, and party at night.
Klong Son: Picturesque bay in the same named village. Quiet and secluded, with no touristy infrastructure. Many activities are close by elephant camp, waterfall, fruit farms, trekking options, and golf.
Bailan Bay: Peace on a budget. Rather stony bay with reddish sand than the beach, so not ideal for swimming. Drinking and dining options.
Klong Kloi Beach: Short and laid-back beach on Chang’s southern coast. Touristy infrastructure can get busy during the daytime.
Salakkok: East side. Small bay surrounded by mangroves far away from the crowds. Robinson Crusoe feeling and kayaking. You’ll need (to organize) your transport.
Salakphet: In Koh Chang’s southeast. Huge bay with a small port. Fishermen villages and waterfalls are close by. Long beach (eastern end) is the place to go when you wish to relax on a quiet beach with less infrastructure.