On weekdays, the park fills with walkers, joggers and picnickers enjoying the ponds and forested areas, but not so on Sundays. Each Sunday, bands and musicians set up throughout the park, and Tokyo’s Cosplay shows up in full force, donning all sorts of 50s-era rocker costumes. Don’t be surprised to see several Elvis impersonators and girls with poodle skirts or rockabilly getups. If you want a look at Japan’s youth culture, it doesn't get much better than this.
If you're here in the spring, Yoyogi has a great scene of cherry blossoms, while the park’s gingko tree forest makes for excellent leaf-peeping in autumn.