Try something new for the first time
Doing something for the first time can be a great way to challenge yourself and to gain new experiences and perspectives.
It can reduce stress and help us break out of our normal patterns of behavior. It gives our brains something to think about other than our daily worries. It might be a mere temporary distraction but it shows our mind and body that thinking about something other than stressful things is possible and desirable.
Some ideas but you are welcome to come up with your own idea:
Try a new restaurant and try a new type of cuisine.
Find a new place to hike or trail to explore.
Visit a new neighborhood and go to a museum.
Go to your local library and check out a book that you would not normally read.
Try new activity that you have never tried, e.g. indoor/outdoor climbing, salsa dances, golf etc.