Dwight Frye

I keep my Z garaged at night at covered all day while sitting in the parking lot at work. Buy a good quality cover and keep your Z well waxed. I also use a Calif. Duster to remove light dust as you don't want to put the cover on a dirty car. Plan on replacing the cover after about 4 years as it will rot from the sun, but your paint & interior will be well protected. My Z will be 3 years old in September and other than a few tiny and unavoidable rock chips, still looks new and still gets compliments.
Edited to add: I keep a small spray bottle of quick detailer and a microfiber towel in a large zip lock bag in the car in case of bird droppings. You do not want that stuff to sit on the paint, even when well waxed. It will etch the clear coat in short order. Clean the bird droppings and put the towel in the zip lock bag until you can get home and wash it out.