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It looks good but I would recommend settling in with a few days in Bangkok first before hopping straight on a flight the next day. The jet lag from flying to Asia is not to be underestimated. It will give you a few days getting familiar with your surroundings and doing some sight seeing in the city before experiencing the contrast with Chiang Mai.
I would then fly/travel in to an already familiar Bangkok at the end of the trip for just a day before flying out.
It looks like I am starting to wrap my head around a not-into-details defined itinerary:
15 days total, Thailand only:
Day 1 - arrive in Bangkok
2 to 5/6 - Chiang Mai (Flight from Bangkok)
5/6 to 8/9 - Ko Lanta (Flight to Krabi from Chiang Mai)
8/9 to 11/12 - Krabi
1/12 to 15 - Bangkok
Things to see/do:
As @anidel was asking, anyone aware of bike trips/tours/routes? especially to explore Chiang Mai/Koh Lanta.
Other ideas/tips/must see tied to this itinerary? Thoughts/tweaks?