Originally Posted by
mecabq
Already been to Bangkok and Chiang Mai this year (and many times overall). You're right, in retrospect, it would have been better to pair a few days city with a few days beach/rural. But I have never been to Phuket or Koh Samui, so it's an opportunity to try them both and decide where to spend more time on another occasion.
If you do this, I would suggest starting with three nights at FS Samui, and then going to Phuket rather than the other way around. Samui would likely feel disappointing if you started at Amanpuri or Trisara and then finished in Samui.
If you can extend the stay by one day, I would suggest adding a day to Phuket, to have four nights at either Amanpuri or Trisara.