Impromptu parade w the kids in the neighborhood. Call around and announce a __ pm meet up (w bikes, wagons, strollers, scooters, instruments) on your front lawn. Decorate vehicles and persons (hats, tshirts) with streamers. March, roll, stroll around the block a few times singing all the "America" songs you can think of:
* Star Spangled (natch)
* Grand Ol' Flag
* America, the Beautiful
* This Land is Your Land
* Yankee Doodle Dandee
* God Bless America
* My Country 'Tis of Thee
http://www.crfcelebrateamerica.org/index.php/holiday-theater/74-music
Afterwards, popsicles and a run through the sprinklers.
[Then go home and eat blueberry pie]