If you need to kill some time and spend some money, check out the outlet mall in Leesburg. It is the best outlet mall in Leesburg.
Old Town Leesburg is a cute area to explore--stroll along South King Street and check out one of the many restaurants and cafes.
Topgolf -- it's like bowling, but golf
It's an adult arcade + bowling. It's in the same development as the Welcome Dinner restaurant, Travinia.