Boyce Thompson Arboretum is a compact but rugged desert botanical garden east of Phoenix where you’ll walk shaded canyon trails and exposed loops filled with cacti, agaves and desert-adapted trees, so bring sturdy shoes, plenty of water, sunscreen and a hat. Expect uneven paths and stairs and plan on at least two hours to see the main exhibits and get good photos; there’s a visitor center and restrooms but limited food service, and a modest entrance fee applies. Visit early in the day to avoid heat and crowds, and check the arboretum website for current hours and special programs.