Advice for father/daughter trip SE Asia

My father 65, and myself 28 are planning a trip together for the end of the year. We have both travelled in SE Asia before. Im looking at going to Northen Thailand, Laos, and maybe Cambodia.

My question is, does anybody have any recommendations on small numbered tours in this part of the world that would be family-friendly suitable (I'm not looking at taking dad on contiki lol)

Intrepid is my first option, which I have used before. Unfortunately, Tuk Tuk Club is all booked out, which was also an option. I usually wing it when I solo travel but am looking for something a bit more structured for my dad and less stressful for me to sort out.

Thanks!