Hi @dwicks, Does your father have a camera and like bird watching? I'm 76 and have a good friend that is 89 that I visit and have coffee with him. His kitchen has a window overlooking his back yard and he has bird feeders fairly close to the house. It's something that brings him a little joy to see the varieties of birds. He even bought a birds of Minnesota book so he can identify them.

Here are a few links that may offer some additional ideas...

7 Mind Stimulating Activities & Cognitive Games for Seniors
-- https://www.sonashomehealth.com/activities-for-the-mind/

Brain Games for the Elderly That Improve Mental Health and Memory
-- https://supercarers.com/blog/games-for-elderly/