One of the hiking or walking trails/paths in Baltimore I like is Stony Run Trail, which follows a creek of that name northward from about Jones Falls. According to one website on trails, it's about three miles mainly on or near a former Maryland and Pennsylvania Railroad line, nicknamed the "Ma and Pa," that ran from Baltimore to York, Pennsylvania, until the 1950s. (According to the time schedule, the trip took about four hours, that is, about 20 miles/hour.)
Here is a map: http://stonyrun.org/what-we-do/walking-path/maps-full-size/ I enter near the Remington Road bridge or by University Parkway. On my way back from Northern Parkway, I usually try one of the roads south, such as Charles Street, to take a look at the houses. The ones with huge porches interest me because I wish more houses had them. When I was a preschooler, our house in Mechanicsburg had a small porch, but I rarely went on it since my mom asked us play in the backyard away from the busy street. One summer while I was in law school, I subletted a room in an old house with a small front porch that had a swing on which I'd read to get out of the heat of indoors.
More information at the Friends of Stony Run: http://stonyrun.org/what-we-do/walking-path/
This sign emphasizes the benefit of reducing stormwater runoff:
From bridge over Stony Run north of University Parkway:
Part of the path. The creek is on the right and houses can be seen behind the trees on the left.
This was in a garden near the path.
