While Cherry Hill RV Park may be closer, I would recommend Greenbelt Park campground instead. It’s not all that much further out, and a drive into the city from Greenbelt, via the BW Parkway, is pretty straight forward. Alternatively you could take the subway from either the Greenbelt or College Park stations. 

> On Jan 6, 2017, at 9:29 AM, Jim Felder <jim.felder@GMAIL.COM> wrote:
> 
> This upcoming spring break (don't know exactly when it will be) I would
> like to take my grandson to visit the Museum of Natural History in DC and
> maybe others. We are in North Alabama, it's a two-day trip if nothing bad
> happens.
> 
> I'm looking for information as to what might be good places to stay
> overnight on the way, and also what campgrounds might be available outside
> DC. And then there's the problem of where to park and which trains to take
> into town.
> 
> Anyone with experience in the area, I would like to hear suggestions.
> 
> Thanks,
> 
> Jim