We will be in d.c. for one full day. Staying in Cambridge Maryland. Husband and I with 5 kids ages 20,15,12,9, and 2. We want to visit museum of natural history, walk past White House, visit mlk monument, Lincoln memorial, visit Arlington cemetery and anything else anyone suggests. We will have a vehicle. We can get into town about 8:00 a.m., and leave around 11 p.m. Someone told me they have a Ronald regan parking garage that is close to the monuments and is only about $20, is this a good place to park? Thank you for any help.