Yes, Koh Samui is still worth visiting. It is one of the most popular tourist destinations in Thailand, known for its beautiful beaches, lush tropical forests, and rich cultural heritage. Koh Samui has something to offer to everyone, from backpackers to luxury travelers. Some of the top attractions in Koh Samui include the Big Buddha Temple, the Hin Ta and Hin Yai Rocks, the Na Muang Waterfalls, and the Fisherman's Village. Visitors can also enjoy a variety of water sports, such as snorkeling, diving, and kayaking, or simply relax on the beach and soak up the sun.