I saw your tweet about Cambodia. I spent two weeks on Bamboo Island! It's what I consider to be tropical paradise. I've just gone through the islands in Thailand and I still long to be back there on Koh Russei. It's good you're going now because the guesthouse Koh Ru and the island in general will be completely changed by a resort being built in April. You won't find white sand, rather, it's a lovely shade of gold/yellow and it squeaks when you walk. Make sure you go on a few fishing trips and go swimming at night to see the phosphorescent plankton glow.

How long are you going to spend in Istanbul? Depending on how long you're there, I've got all kinds of non-mainstream "for locals only" tips for that town (was born there, all my fam is there, spent a summer in college there, etc) and tested them out on my wife for our honeymoon last year.

Looking good.