Catch a flight to Ko Samui, the ultimate backpacker&rsquos paradise. With colourful corals, blue lagoons and pristine white beaches, your Thailand trip is incomplete without a visit to Ko Samui. A plethora of activities are available for travellers here&mdashfrom diving, snorkeling and partying to simply lazing around on the beach.Head to the Ang Thong Marine National Park, an archipelago of around 40 small islands. With limestone cliffs, caves and corals, the park is a popular place for diving and other water sports. Lamai Beach is home to the bizarre rock formations called the Grandfather and Grandmother rocks that resemble human genitalia While you are there, you could also visit Hua Thanon, a charming fishing village to get a glimpse of life on the island.If you are in the mood for some quiet, relaxed time at the beach skip Lamai and Chaweng and go to Big Buddha beach or Mae Nam beach.