A Day's Outing

This District-founded outdoorsing service has just released a geolocating iPhone app that lets you browse adventures by type (like Food & Wine, or "Unique Sports") or pull one up randomly by shaking, with outings including everything from a tour of Castle Gruen Vineyard, to a day trip out to the Cedar Point Gun Club, to a Harpers Ferry hike to Split Rocks Overlook -- though if you're looking to watch people splitting rocks, really anywhere in Rock Creek Park will do.