6 weeks Thailand travel

My partner and I will be travelling Thailand for just over 6 weeks from Christmas. We have two rough routes planned but undecided which one is best as we don’t want to cram to much in so struggling to choose between trang province or trat province as both look incredible. We late 30s/early 40s. Love islands, nature and exploring. Open to any other suggestions/locations. Thank you!

1st is : krabi, khao sok, Ko Pha Ngan, Ko tao, koh kood, koh mak, Bangkok, chiang mai, pai, chiang rai.

2nd : krabi, khao sok, koh lanta, koh lipe, Ko Pha Ngan, Ko tao, Bangkok, chiang mai, pai, chiang rai

Author: Glad-Life-8255