Saguaro National Park is located on two sides of Tucson, Arizona. The unit on the west side is supposedly mostly desert and a gazillion cacti; the east side includes the Rincon Mountains so has areas with higher elevations and a forested environment. Most of the Rincon unit is wilderness accessible only by hiking, which we didn't do.
Well, we did get out of the car and do some walking, but not much. When Saguaro was added to the National Parks system it came in as a monument and, like a bunch of others from the 1930's, was set up to encourage windshield tourists.
There are stops at a couple of short trails where you can amble through the cacti, getting up close views of the teddy bear cholla and the giant saguaro, and read various wayside signs explaining to you just what it is you're seeing. We stopped at a handicapped accessible trail to check it out.