Yes, really, just getting outside, in nature, has been shown to improve your health. I won't ply you with a zillion links, you can search on it and quickly see many studies on this.
Go for a walk in nature, preferably someplace more 'natural' like a forest preserve vs a park...but even a park or a walk around your neighborhood is better than nothing.
But here is the key...BE THERE. Be present. Don't be gabbing on your cell phone or stressing about work or whatever. Really ENJOY Mother Nature and all she has to offer us. Really notice the trees, the leaves, the flowers. Hear the birds singing and the squirrels scurrying. Take off your sunglasses and let some daylight in! (You can also search on how this helps with sleep...getting the BRIGHT light that only the sun can produce helps your brain recognize day from night).
If you are with other people, BE with them. Keep conversation light, no stress. Have some periods where you are just quiet and enjoying nature. Be sure to take some deep breaths as you go.
I have a younger family member with anxiety issues. I dragged him (yes dragged, because teens aren't keen on nature, LOL) to a forest preserve and he literally got calmer than I'd seen him in a long time and let his anxieties melt away. Give it a try!
I also have a neighbor who is 95 and lives on her own. She takes a walk outside every single day, rain or shine. The only exception is icy days. I have a strong hypothesis that these daily outdoor walks are a large reason for her longevity and good health at her age!
Oh and if you're into the energy or Qi of it all, you are also getting fantastic energy when you are in a natural setting like that (which is also good for health).
And now, with the beautiful fall colors coming, even more reason to enjoy!