There is fun for all ages on a Sunday!
Go for a walk alone and clear your head
There are so many delightful places to walk alone and think about just about anything.
I remember in the movie "A Hard Days Night" Ringo walked alone and had a good time.
It's a good thing to go for a walk alone sometimes, and clear your head of all of the troublesome thoughts of the week.
If you go on a Sunday, there is usually no job or other responsibility about which to worry.
Now if, you live, near a coast line or by the ocean, it is a fantastic place to walk and pick up things that floated ashore to look at and contemplate the powers of the universe.