"Circuit Hikes of Southern Arizona" is an easy-to-use guidebook, describing the many circuit hikes hidden in the mountains surrounding Tucson and throughout southern Arizona. The guide includes 32 specific hikes with an additional two dozen options, with hikes ranging from so easy you can take your toddlers to so strenuous you will want to train for weeks beforehand. Each hike comes with an easy-to-read topo map, as well as detailed instructions for route-finding. The guide also provides information about the best seasons to do each hike as well as general information about the history and geology of the surrounding mountains. The guide not only includes some of the best known circuit hikes of southern Arizona, it also includes a number of previously unpublished trails that take you to places rarely seen by most hikers. The author, Robert Zimmerman, is an award-winning science journalist and space historian who likes to spend his weekends hiking, caving, and in general exploring the hidden outdoor gems of the American southwest.