Shutting off the thought process is not rejuvenating the mind is like a car battery - it recharges by running.
For the last third of life there remains only work. It alone is always stimulating rejuvenating exciting and satisfying.
I used to love to draw. I didn't want to go to art class because I felt that would be too corny when I was young but architectural drafting was the cool thing to do because there was more precision. It taught me a lot about building and structures and doorways and frames and windowsills.