Although there are several options for an ocean beach brunch in Koh Samui, I heard about the wonderful Sunday Brunch at the ocean club, Beach Republic Koh Samui.
They serve an extensive buffet of Thai and international cuisines from breakfast foods to all the dishes of a Sunday roast lunch. There are also salads, seafood, barbecue, and even desert so there is something for everyone.
Beach Republic is definitely the place for an ocean beach brunch in Koh Samui! I really enjoyed the food here and can't wait to come back.