Some ideas:
- go on Google Maps and search for the nearest national park; target areas that are mostly green.
- Select the time of exit that is late at night, between the hours of midnight and 5 AM.
- Go on Google Maps and search for the nearest main highway that would take you into another state. Start driving and don't stop until you're in the middle of the road between two cities. And you can pull over and walk to the nearest secluded area.
- find the nearest major highway and pull over at a truckstop/rest stop area, again in the twilight hours.
- Since it's the middle of winter, you can also search for the nearest campground. Since people don't typically camp this part of the year, wherever you go will be pretty isolated. Pay for a couple days of parking, and hike to an area Where there's no campers around you.