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Located at Bronx Park in The Bronx, New York Botanical Garden is a 250-acre outdoor museum that features over one million vegetation and flowers. If you visit the garden from March to May or September to November, you can have your favorite sandwich under the cherry blossoms as it is in full swing. You can check out their website for any cherry blossom viewing events. Source: https://www.marcofeng.com/usa/best-places-for-picnics-in-nyc

New York Botanical Garden

Picnic Sites Around the United States.
Whether you enjoy sitting atop the cliffs of Malibu to watch the sun set over the Pacific Ocean or appreciate the quiet beauty of Lake Calhoun in Minnesota, the varied geography around the country ensures there's a picnic spot that fits your personality. https://www.thepicnicworld.com/best-picnic-spots/