Go for a slow, gentle walk outside
Put in a bird feeder or bird bath so you can sit and watch birds
Color - buy a big pack of crayons or colored pencils and Google "coloring pages for adults" or "free mandalas to color"
Play with play-doh or legos
Listen to a meditation or guided relaxation podcast
Do chair yoga
Give yourself a manicure or pedicure
Download a nature sounds app for your phone and listen to it with your eyes closed
Brush and floss your teeth
Take a bubble bath
Experiment with different hairstyles
Take a nap
Snuggle with your pet and/or child
Call friends on the phone
Buy exotic fruits and taste them
Bake cookies or some other very simple recipe
Mindfully peel and eat an orange
Mindfully make and drink a cup of herbal tea
Knit
Crochet
Read (or listen to an audiobook) if it doesn't stress your eyes or your brain