Depending upon your exact location, it might be a bit of a drive, but the Torrey C. Brown Rail Trail (aka North Central Railroad, or NCR Trail) in Baltimore County is really nice.  It parallels the Gunpowder River and extends into York, Pennsylvania.  It is mostly shaded, and even has a section with exercise equipment stations alongside.

http://dnr.maryland.gov/publiclands/Pages/central/tcb.aspx

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