Is the car special to you? Is it in good shape with decent mileage? Have you had it long enough to know everything wrong and right about it? These are the question you should be asking yourself. Chances are you will take a hit in selling the car (there are exceptions of course) and the chances of replacing it with an identical car for the price you got rid of it are not great. So factor that in when deciding about price. Now if you hate the car and want something different anyway this may be the time to do something.
Notwithstanding the foregoing, keep the car and make it an adventure. I spent two summers in high school traveling the western states of US with a group of kids and adults in two vans and camping at various locations. I saw so much more of the US that summer than most people see in their life. Take time and make it an adventure. See things like the Bad Lands, Grand Tetons, Yellowstone, Yosemite, Glacier National park, parts of the Oregon trail, etc.