Caring for critters, watching them thrive. Ditto for my sons. Ditto for hubby but he's a stubborn meadow muffin.
Short term, anything nature. I ain't no stinkin' tree hugger. I'm a CREATION hugger. I could have NASA picture of the day for breakfast, lying on the grass for lunch, and a thunderstorm for dinner. Listen to the trees talking to themselves at night, cicadas, foxes yipping, and my sheep bells ringing for a bedtime snack.
When I was a kid in Calif, I'd run off and sit under clumps of globular eucalyptus and pretend I lived in the woods in Montana. Even those things. We had a grove of the real eucalyptus nearby too. I have a box of the parts that came off their seeds when they fell. It's a much different fragrance than the one used in commercial products. It's the smell of escape, freedom, and mental clarity.