The 320-acre Boyce Thompson Arboretum is a birding haven. A number of rare species have been spotted there, including elusive warblers. The arboretum is near the town of Superior, so Phoenix residents will have to make an hourlong drive. Still, for die-hard birders, it's a small price to pay in order to add a few rare species to the life list. Founded by copper mining magnate William Boyce Thompson in the 1920s, the botanical garden is the oldest of its kind in Arizona, with miles of trails amid cactuses and craggy rock formations. Take advantage of a guided bird walk to learn why the arboretum has acquired a reputation as a hotbed for an array of birds, including warblers, hummingbirds, woodpeckers, and thrashers.