Yeah, go to Phi Phi
One of the reasons why I didn't like Phi Phi that much was because there were so many farang woman around. So I would suggest you take a nice caring bargirl from Patong and go to the island with the three of you.
Yes, I said nice and caring. Can't get to excited on your age, might be harmful for your health.
85 years old, hope I still can make those trips by the time I reach that age.
