Nearly 100 tropical islands dot the Gulf of Thailand, but when it comes to choosing the right one, you can really condense any decision down to the three superstars that together form an unbeatable triumvirate, each offering a different slice of holiday heaven.
Whichever one you choose make sure you spend a day exploring Ang Thong Marine National Park, an area of outstanding natural beauty made up of 40 plus idyllic jungle clad islands frosted with white sand beaches and surrounded by coral studded aquamarine seas.
Koh Samui
Koh Samui is the largest and best known, with regular flights from Bangkok, Kuala Lumpur, Singapore and Chiang Mai amongst others. 
Ringed by beautiful sandy beaches and filled with a green mountainous interior, Koh Samui has something for everyone and is particularly blessed with 5 star luxury hideaway resorts that specialise in pampering you to within an inch of your life. Koh Samui is sophisticated and cosmopolitan and has everything you need for a hassle free, picture perfect beach holiday right on your doorstep. You can relax with your decision to come here and just look forward to your holiday.
Koh Phangan
If Koh Samui sounds too civilised then head off to Koh Phangan, the livelier neighbour made famous by the Full Moon parties. Thousands still flock to party, but this is only one side of the island’s personality dig a little deeper and you’ll find a wonderfully laid back and carefree soul that is the keystone to the island’s character. To discover the real charm of Kon Phangan head up to the northern shores with its beautiful beaches, wild jungle and hidden, intimate resorts.
Koh Tao
Diving, 
diving, diving: whether you’ve been meaning to learn or are a scuba veteran, Koh Tao has a reef for you. Similarly snorkellers will be rewarded with an aquarium view at every turn. Don’t worry if you’re undecided or not interested in the underwater world, as Koh Tao can offer the requisite white sand beaches, jungle interior and clear blue sea. The island is still evolving and so you’ll find a great cross section of hotels, bars and restaurants that give it a less polished more natural feel. Holidaymakers are really here to enjoy the island’s natural riches rather than the resort’s facilities.