Wren has a site at Cactus Country RV Park just outside the city limits of Tucson close to the entrance to Saguaro National Park. My husband, a young friend, and I have hiked the trails there many times over our three-week stay. The senior pass we have includes anyone in the car, so we all get in free. The visitor center has good exhibits, books, video screenings, and rangers to answer questions. We’ve had no trouble “getting our Fitbit steps.” We hit the trails on foot, unlike many who choose to bring a horse and get much further than we can into the interior of the park.