Three places...
My cars. I love to drive and sometimes take myself on a drive to nowhere, just to clear my mind and relax. Also, DD and I have had some of our best talks ever, sitting in the car, parked in our driveway, in the darkness of night time. There is something close and personal about this for us.
My sister's apartment. Whenever I need a fast get-away, be it overnight or for multiple nights, her place is always open to me. She lives <200 miles away, so easily less than a 3 hour drive. Sometimes, my brain just needs the space, the relief from being away from my every-day responsibilities, and her house is the place I go.
The ocean/beach. When I need to contemplate, plan, celebrate, grieve, or clear my mind, sitting on the rocks at the edge of the beach/ocean is my place to go.