As answered on your Khao Sok post:
With only 2 nights at each place you are going to take a lot of your precious time up in transfers, best part of 1 day between each.
When are you planning on and where will you be coming from to Koh Phangan? Both relevant to identifying routes and transfer options/times. Cost of accommodation in Low Season is cheaper than High Season but seasons are different between Koh Phangan and Khao Sok (Cheow Lan Lake)/Phang Nga Bay.
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