I've scanned through 20+ pages of recent postings, and lots of people asking about parking and/or taking the Metro to the National Mall. All of these solutions will cost over $25 per group.
I'm wondering if it is feasible to drive to a shopping mall, or somewhere I can park my car safely/freely and then catch a circulator bus to the tourist sites (National Mall). The cost of a ride is only $1, and a day pass is only $3. So maximum for the 3 of us is only $9 per day.
We (3 people) are visiting DC on June 30 (Monday) and July 1 (Tuesday). I plan to stay at the National Mall until just after it gets dark (~10pm). Our hotel is in Stafford (it was very very cheap!)