White Clay Creek State Park is a serene state park bordering Newark to the north. In the summer, there are concert series and films are shown on large, outdoor movie screens. The walking trails are well-blazed, and many "unofficial" trails lead off to private properties. The only downside is that if you don't live in Newark, you have to pay to park your vehicle. There are also plenty of picnic tables and a few shelters for large gatherings.
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