Cherry Blossoms and Magnolias blooming are among the first signs of Spring. Depending on the weather, these blossoming trees bloom anywhere from mid-March to mid-April.
Dumbarton Oaks is actually a museum that also has a gorgeous garden. The stroll down a cherry tree-lined lane is something out of Victorian movie set.
This lovely (really lovely) arboretum in Baltimore blooms fairly soon after the blossoms in DC. They have amazing cherry blossoms and magnolia trees.
A few years ago a ton of cherry trees were planted and a park was created on the entire block of 1600 N Appleton Street and extends at 1500 Block of McKean.
Ft. McHenry is a National Park so make sure your kids snag their Junior Ranger booklet from the Visitor Center. In April, the cherry blossoms are absolutely stunning.