Yoyogi park is one huge park in Harajuku. It's located close to Harajuku station, not Yoyogi station. Great for cherry blossoms, picnics, other activities, sports and just walking. The place got some street food and Japanese desserts such as crepes and ice cream. They sell seasonal flavored ice creams as well.
2-1 Yoyogikamizonochō, Shibuya-ku, Tōkyō-to 151-0052, Japan