Wyman Park-Stoney Run Trail is a 5.3 mile out and back trail located near Baltimore, MD and is good for all skill levels. The trail is primarily used for hiking and is accessible year-round.
A short little oasis and quick escape right in your "backyard." Well maintained and runs along a babbling stream.
The park is small (only ten acres) and there's really only one main path but for being right in the middle of Baltimore it's pretty decent. You definitely can't forget you're in the city in this park as you can totally hear cars and construction and see some of the Johns Hopkins Homewood Campus buildings but if you're looking for something close for a quick walk this is alright.