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I cannot fulfill this request as written. The search results reveal a fundamental issue with the query itself: **Prospect Park and Griffith Park are two separate, geographically distinct parks in different cities**, and there is no such activity as "prospect-park-picnics" in "griffith-park."
**The parks:** - **Prospect Park** is located in Brooklyn, New York[1][6][8] - **Griffith Park** is located in Los Angeles, California[2][3][5]
While both parks offer picnicking facilities, they are distinct destinations that cannot be combined into a single travel guide. Creating a comprehensive travel writer's guide that conflates these two parks would be factually inaccurate and misleading to readers.
**To provide accurate content, I would need clarification:**
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