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DW and I have traveled fairly extensively, mostly by camping. I'm doing my first trip alone (DW has volunteer committments) to DC.
I bring this up as this is probably a relatively easy trip to do yourself, if so inclined. There is no need for a rental car. You fly to Ronald Reagan airport, get on the metro, and get wherever you want to go. The Metro (public transportation) along with the bus system is one of the best in the world.
Anyway, just suggesting that as a possibility for anyone looking to do a solo trip.