I have spent a total of 6 months in Thailand specifically for SCUBA diving classes and instructing. I can specifically tell you Koh Phangang is not the best place for spending your time lounging on the beach and SCUBA diving.

The first thing to look into is the weather in Thailand. You can break up Thai beaches and SCUBA diving between a western side (Adaman Sea) and the eastern side (Gulf of Thailand). Check on a travel website or weather website on the average rain fall by month in specific places. This will tell you generally where you want to be east or west.

If it's rainy on the east (Koh Samui, Tao, Phangang, and Phi Phi), start off in Phuket (take classes there if you need them) and then get on a dive charter to the small islands of the coast in the Adaman sea. This is where you will see anything and everything that is under the water in Thailand. Some charters even have an agreement with the Burmese government (Myanmar) and you can explore there too (some don't but will still go, as of yet I haven't read anything about the Burmese hassling any charter boats). With so many of these islands unexplored or inhabited the vis is great and the reefs are about as pristine as they get. After a charter there is plenty of time to lounge on the beaches of Phuket or Lanta.

If the weather is the opposite and the east is dry and the west is rainy, stay on either the islands in the Gulf (Tao, Phangang, Samui) or up north in the Phi Phi area. Phi Phi and Koh Tao are as chill at it gets in Thailand when it comes to SCUBA diving; minimal prostitutes propping you at clubs and bars, the streets are not completely lined with stalls trying to sell you Chang beer shirts or tailor shops. These communities are built specifically for the SCUBA tourism and expats who want a quiet beach to live on. There is a large 18-28 year old crowd of people who come by Koh Tao for dive classes before and after the full moon party but other than that, the island is almost always just divers or students. The beaches are great at both places (Phi Phi and Tao) and because its Thailand, there are always good night spots to party. Keep in mind though, if you don't like diving and are tired of laying on the beach there aren't too many other things to do at these places.

Koh Phanang and Koh Samui are kinda over done. Samui is where you go if you want to say went somewhere off the beaten path in Thailand. Think of it as saying to went and toured Mexico but really only hung out in Tijuana. Samui however does have real hotel chains, (they are even opening a W soon, yay???) and they have the elephant rides, tiger farms, Muay Thai fights almost every night. You can buy all the touristy stuff like the t-shirts, pirated dvd's, and meet the local girl of your dreams for 200 baht and hour. Phangang is pretty much the same thing except all the other tourists are stoned or high on something. This isn't a slight on Phangang, its the tourist crowd that they market to and that is who they normally get. There are quieter sides to both islands but they are few and far between.

These two islands, however, are the only places you can get a charter to the Angthong National Marine Park. These are a smaller version of the Adaman islands but on the east coast. These are the islands where Alex Garland set "The Beach" when he was writing it on Koh Phangang. Awesome place to dive when the weather is right.

If you need to take classes goto Koh Tao, and then move on to the marine park. Koh Tao is a bit of a certification factory but all classes are generally taught by some expat from your country of origin and want you to be able to enjoy diving.

For accommodations, make a two night reservation for wherever you are going and then spend those couple of days figuring out where you want to spend the rest of the week. This is because whatever was cool last year or 6 months ago could be doing a remodel or an expansion (this happens all the time in Thailand, the tourist industry there seems to be recession proof because its is all ready so cheap.) The best places I've found for this are Agoda.com or Latestays.com.

If you have any other Thailand questions: http://www.lonelyplanet.com/thorntree
is a great place to post. People who have been, people who are going, and people currently there all log in to find out everything from current hotel prices to which Thai border crossings are the easiest to get an extended visa.

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Koh Phangan for night life - usually best just before the Full Moon party, which is unmissable.

Koh Tao for scuba diving - quiet nightlife but the best scuba diving.

Koh Phi Phi for a mix of both - great for lounging on the beach too.

Phuket - stay clear, the sleeziest place I've ever been in my life.

And for something different try Tubing in Vang Vieng, Laos.

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