Hi everybody,
where are the best beaches (white sand, blue sea, not so much crowd) for a march trip? My wife and I would like to spend like a month with a US$ 150/day day.
Thanks everybody.

Are you going to spend the whole month on the beach??? We loved Koh Chang for the very reasons you stated. Check out Barali for a waterfront bungalow for around that price.

There are some great small islands in Southern Thailand with places right on the beach, they are very quiet and relaxed though.
For a month though would you want to stay in one place?
You could mix a beach resort area with perhaps a week on a small quiet island.
Also tell us how quiet you want it to be, or whether you want restaurants, shopping and entertainment.

i would second koh chang...look at amari emerald cove....

try a couple of other places also...

khoa lak at the le meridien

krabi at amari vogue

not sure of current prices

Check out the islands just off Ranong (Ranong not Rayong) in the south of Thailand.

Some lovely quiet islands there and hardly any tourists, well off the beaten track.