If you have 9 days in Thailand, and since it will be for honeymoon, I think you should plan something fantastic... Being too much in a city is not so romantic and Bangkok, despite of being a very interesting city, is also too crowded, polluted and tiring so I could suggest you to stay 2 nights. Then maybe you could move to Chiang Mai, a more peaceful city and much nicer than Bangkok and if you want to explore the numerous temples, feel the atmosphere and experience Loy Krathong at its best, probably 3 nights would be great.
Finally, 4 nights by the beach to relax and be in a romantic atmosphere seems to be essential during such a trip and Koh Kood is a paradise with pristine beaches, very thin and white sand and crystal clear sea water.
To resume, find the itinerary with my suggestions for hotels:
-20th to 22nd of November: Bangkok, Mandarin Oriental (prefer a State Room)
-22nd to 25th of November: Chiang Mai, Rachamankha (prefer a Deluxe room or a Suite)
-25th to 29th of November: Koh Kood, Soneva Kiri (any villa is amazing)
If you need more informations about these 3 hotels, feel free to contact me.