DC sucks, you can look at all the monuements on the internet without having to sweat your balls off outside.
go to baltimore aquarium since thats indoors, then take the kiddos over to ESPN zone right by and let them play some games, while u play too, i always play the quarter back game and throw the balls as hard as i can at the reciever player's heads and try and break the game and ruin it for everybody else.
or get high and go to the air and space or spy museum.
or if you wanna workout with me or have a meetup give me a let-know. we can work muscles together