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Photo: CrabTree13, CC BY-SA 3.0 via Wikimedia Commons
It's near the airport, so it is not in Windsor, but it's close. PCAM is definitely worth a visit for those interested in airplanes, or those with children old enough to be interested in the wide variety of (mostly) military planes, helicopters, and aircraft-related displays.
The Pacific Coast Air Museum is an aviation museum located at Charles M. Schulz–Sonoma County Airport in Santa Rosa, California. The museum displays a varied collection of over 30 American military, propeller, and jet aircraft.
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With the least-developed trails, and more elevation changes