On vacation we like to get an early start to avoid crowds and the heat. We are staying at the Chevy Chase Embassy Suites and will be using the Metro for transportation. We'd like to visit the monuments early in the morning, but we are concerned about the Metro being crowded because of rush hour. We will be traveling with our 6 and 8 year old granddaughters. Would it be better to wait until the evening to visit the monuments? When does the Metro crowd begin to lessen in the morning? I realize the fare is more before 9:30 AM. Thanks for any help.