Year-round, but especially in summer, locals flock to Coronado National Forest to hike, picnic, and enjoy the waterfalls, streams, swimming holes, saguaros, and shade trees. No cars are allowed, but a narrated tram ride (about 45 minutes round-trip) takes you up a WPA-built road to the top of the canyon; you can hop off and on at any of the nine stops or hike any of the numerous trails.
There's also a shorter tram ride (or you can walk) to adjacent Bear Canyon, where a rigorous but rewarding hike leads to the popular Seven Falls (it'll take about 1½ to 2 hours each way from the drop-off point, so carry plenty of water). If you're in Tucson near a full moon between April and November, take the special night tram and watch the desert come alive with nocturnal critters.
Sabino Canyon Rd. at Sunrise Dr., Tucson, Arizona, 85750, United States
520-749–2861-recorded tram information; 520-749–8700-visitor center