Fiancee and I are planning two weeks in September in Thailand for our honeymoon. We don't want to travel all that way to spend the whole time on the beach, so I think we have a decent itinerary, but wanted to see if people thought we were too ambitious and/or had other suggestions on how best to experience Thailand in two weeks.

Neither of us has spent much time in SE Asia before, either.

9/14 -- arrive 4pm into BKK
9/15 - 9/18 -- BKK
9/18 - 9/20 -- Chiang Mai
9/20 - 9/23 -- Koh Samui
9/23 - 9/26 -- Sin (flying out late on 9/26). Would prefer to spend another night in Samui, but Bangkok Air doesn't have a Samui-SIN flight on 9/24.

What do people think? We're debating cutting out Chiang Mai, as it seems to be a bit too much flying around, and spend more time in BKK and Samui, but from what I've read, Chiang Mai seems like quite an interesting place, more so than BKK, which strikes me (possibly incorrectly) as more of just another large city?