About us

Grand Sea Discovery Co., Ltd. is a Koh Samui based tour business that has been established since the year 1992. We operate speed boat tours and special charters with routes from Koh Samui to the nearly islands.

The company is exceptionally experienced in supplying high quality services to locals and tourists from all over the world with 80 percent of our customers being foreigners and 20 percent are Thai. We have built a name of quality and customer care by ensuring our staff keep high standards of personal service, safety, client attention and clean vehicle conditions, all to satisfy the needs of our customer.

Our experienced staff and multi lingual guides are 100% committed to all our guests enjoying their precious holiday time with us. So climb on board with Grand Sea and discover exciting, sensual, tranquil and beautiful Samui.

The Island is a very good place to relax and forgot the noisy places where you stay. The busy places of Chaweng which is the heart of Koh Samui where night life is always vibrant and strong for young people, and old. it is all applicable for everyone when you visit other places like Fisherman's Village where shopping and sightseeing looking for the old Houses of people from Samui which is now transformed into a Bar, Restaurants, and Guesthouses or Inns..

The Island also have a very nice places to shop and explore some good Night Markets like Monday it is in Chaweng, Tuesday it is near the Tourism University, Wednesday it is near the Lake, Thursday it is in Maenam, Friday - Fisherman's Village, Saturday it is Chaweng, Sunday it is in Lamai.

OUR Speed Boats

Tour Program

From your accommodations there is a shuttle bus to bring you to the pier and transfer you back when the trip is completed everyday. Our entire English speaking staff will be your assistant, and give you advices and help you to enjoy your entire trip. Light breakfast, Thai menu for your lunch, soft drinks on board and snorkeling gear are also provided. The last important thing, our nice staff will promptly assist you & take good of you through your excursions

The first one is " Koh Tao-Koh Nangyuan  " we would suggest to the guests who love the undersea world. Take a look at the " Crystal Clear " which is only at Koh Nangyuan, the smooth white sandy beaches and the naturally clear water which will make you forget how busy your city is.

The second trip "Angthong National Marine Park" we will bring you to  "Koh Wao", the best place to do snorkeling alongside the beautiful corals. Then, let’s go to see "Talay Nai", the green emerald lake that's surrounded by the island. Moreover, there are 2 activities waiting for you to challenge: either kayaking or even climbing up to the scenic mountain’s top. The next trip would be "Koh Pha Ngan", the island is not far from Koh Samui. The best snorkeling place there is at Koh Ma. And the beach named "Haad Rin" where is not only the "Full Moon Party", the most famous beach party, is held but also waiting for you to get honey tan skin by taking a sunbath at the daytime too.

As the Full Moon Party, if you would like to join the amazing nightlife fun, we also provide speed boat transfer in the full moon night, starting from 6 pm. till 7 am. Moreover, we also operate for tour groups, private speedboat charter, city tour around Koh Samui, Minibus transfer, etc. More questions or need advice about Samui, contact us at

+66 8 3104 0355, +66 9 8015 2601, + 66 (0) 77 427 001
Fax : + 66 (0)77 425 60