Events are somewhat monthly (check the online calendar), and feature everything from the obvious hanging out with "farm" animals to live bands and vegan potlucks.
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While its principal purpose is as a stocked hunting range, McKee-Beshers WMA is best known for its magnificent fields of sunflowers, in bloom towards the end of July. The sunflowers were planted not for public enjoyment—they are there to attract doves for the hunt! But there are miles of trails through the fields and forest, which do connect with the C&O Canal towpath, and the WMA is quite popular with photographers. Be sure to bring heavy duty insect repellent, long pants, and good boots, as the terrain is pretty marshy. It's a good idea to give them a call to see what the hunting situation is like—it's less pleasant to walk around the fields if hunters are out in force.
A fun getaway for picking fruit, pumpkins, Christmas trees (or they also have a shop out front if you just want to stop by and get some great fresh produce and other farm goods). Especially if you are with kids, be sure to look for the farm animal petting zoo!
Perhaps Maryland's best-known and most prominent monadnock, it's full of hiking trails and beautiful views over the Piedmont Plateau and towards the Appalachian Mountains. It's quite popular during the busy summer months, as it's less than an hour's drive from Washington, D.C. While a National Natural Landmark, it is a rare example of a privately owned (nonprofit) park open and intended for broad public use. Beautiful day trip. Parking is limited.