Thailand forum

Hello,

My wife and I are travelling in Thailand/Singapore from the 24th of december till the 24th of januari. It’s are second time in Thailand, so we visited already: Bangkok (several tilmes), Kanchanaburi, Ayuthaya, Sukhothai, Lopburi, Chiang Khan, Nongkhai and Koh Samet. We also have visited Cambodia and Vietnam for a month, so we don’t mind travelling in less comfortable circumstances.

We like a little bit of everything, so I tried to make an itinerary with some culture, nature/trekking, beach and major cities.

Is this itinerary do-able ? Do we forget some not-to miss places ? Are there places we better avoid during the high season ?
Any suggestion is welcome to improve are experience in Thailand.

Itinerary :

24/12 : leaving from Brussels
25/12 : arriving in Singapore
26/12
27/12
28/12 : Singapore
29/12 : flight to Chiang Mai
30/12 :
31/12 : Chiang Mai
01/01 : bus to Mae Sot
02/01 : Mae Sot
03/01 : trekking in/to Umphang
04/01 : trekking
05/01 : Umphang and return to Mae Sot
06/01 : bus to Mae Sariang
07/01 :
08/01 : Mae Sariang
09/01 : bus to Mae Hong Son
10/01 :
11/01 :Mae Hong Son
12/01 : flight to Phuket via Chiang Mai
13/01 : Phuket
14/01 : boat to Ko Phi Phi
15/01 :
16/01 : Ko Phi Phi
17/01 : boat to Ko Lanta
18/01 : Ko Lanta
19/01 : boat or minivan to Krabi
20/01 : flight to Bangkok
21/01 : Bangkok : cycling tour with Co Van Kessel
22/01 : shopping in MBK
23/01 : return to Brussels
24/01 arriving in Belgium

Thanks in advance for any advice !