Everyone should have a backyard retreat of some sort I think. It's a place for you to go to unwind, relax, gather your thoughts and just be after a long day. It's a place that can be enjoyed alone or with others.
A backyard retreat can be simple or elaborate. You don't have put a lot of money into it for it to be beautiful.
It should have your favorite outdoor things such as plants, furniture, sculptures and water features. You may also want bird feeders or bushes that attract butterflies. Whatever brings you a sense of calmness and joy.
A house that can provide those things to a future owner will appeal to househunters. Your tastes may not be the same as theirs but they will see the potential in already having a designated space.