Thailands Islands are beautiful .We see them all the time on tv.Thats why most people go to them because of their beauty ,luxury and beaches. 
I can asure you that their are more islands that are not that often visit by foreigners but only by Thai people, i know that because i have a Thai girlfriend who knows these islands. 

1 of those islands is named Koh Kood or Ko Kut.it located in the south west of Thailand. 
you travel their from The national Airport with small plain to Trat Airport from their with a minibus to the pier.then with a boat about 45 munits to the Island Koh Kood. on the way to That island you will see many other islands and beautiful landscapes.Koh kood has many resorts
 

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Trat pier 

I went to The beach resort on Koh Kood.i will show you some pictures from the resort and the cabins you will live in. It's not as luxury as Phuket or Phi Phi but who cares you have holiday and all facalities are there just more simple .You will see that in the price to. 

Naturally i will take time for info about other islands because not every one is as me .