Kamakura isn’t just temples and shrines. Being surrounded by the ocean and thickly forested hills—the same reasons that made it a good, strong capital—make it a good, strong choice for outdoor enthusiasts.
Those without equipment can rent and/or take lessons from various outfitters and water-sport schools in the area.
Of course, not all activities require equipment. Yuigahama Beach is great for summer swimming (just have some jellyfish repellent ready by mid-August), and hiking is enjoyable year round.