Great post, Musken. You did not mention the Thai boxing lessons at Trisara that your husband and son had. How was this? (I was right behind you, hence the question!).
As for Aman beds - you MUST always ask for a mattress topper whenever you go to an Aman (apart from Sveti Stefan island where they have Coco-Mat beds). Our beds were always really comfortable (because we have mattress toppers).
Heard that Trisara will be re-fashioning its spa soon - I agree that it needs refreshing. Great treatments though.
Glad you enjoyed both resorts. I, too, like to stay at both.