HI Cheryl!
Because our family lives in our RV, we stayed in the Greenbelt National Park Campground. It was beautiful (my son woke up the first morning we were there and couldn’t get over how green it was) and affordable, and they did offer tent camping, However, it was definitely camping, and only offered very basic bathhouses and no other amenities. The bathhouses were not the worst we have experienced, but the bugs did tend to make themselves at home there despite regular cleanings.
If you are looking for a hotel, I recommend finding one through Orbitz. They often put out coupon codes, and you can go through Ebates to get cash back a well. We are not loyal to any one hotel chain and always find great deal by using the Orbitz/coupon code/Ebates method.
The public transit is excellent in DC, so getting where you are going shouldn’t be a problem even if you are staying a bit off the beaten path.
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