L.A.‘s Sand Dune Park is a go-to recreational point for fitness buffs, professional athletes and hyperactive children. It’s also a reminder that the sand dunes once composed the majority of the city’s South Bay area. Ever since L.A.’s geography has changed to cater a sprawling city, the sand dunes remained intact, and began to attract a large following of amateur and professional athletes. Stretching 270 feet long and 115 feet wide over its sharply angled slope, the Sand Dune Park is the perfect spot for some hard-core open-air recreation. Just beware to ensure sustainability, a reservation is required beforehand.