First timer for Thailand, Tips on great sightseeing

[rvacation]

hi,
Could you help a starting traveller out by any chance?
I'm leaving for Thailand in a couple of days and was wondering what great spots are out there to see. I's a very broad question i know... so i'll try to break it down some
i only have a month and have a very rough sketch of what my travel itinerary will be.
Starting off in Bangkok, then up to Chiang Mai, heading east to Cambodian or Laosian border and down again towards Ko Samui/Ko Phanang/Ko Tao before heading for home again...

thanks......

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