When you say that you’re not interested in walking, how much walking ARE you able or willing to do? Are you physically challenged? Is a 30 minute walk from the car out of the question? This can greatly affect my recommendations.
Assuming you don’t want to walk at all and will be viewing the world through your windshield, or within sight of your car, here are some suggestions.
Rocky Mountain National Park
Grand Canyon
Pacific Coast Highway
Badlands (from overlooks)
Capital Reef National Park