I am taking my teens for 2 weeks, probably staying at the Marriot Metro (due to all the advice on here.) I would like to rent a car for about 3 days and visit Gettysburg for a day and Chesapeake Beach for a day. Is there any other off site must-sees or must-dos, given we have plenty of time? I have a great package deal with air and hotel for 2 weeks for the same price it was going to cost me for airfare alone, so I won't be hotel hopping around the area. Is Chesapeake beach the best place for a beach day? I have also read on here that if the site suggests it is a 2-3 hour drive, it will actually be 3-4 hour drive, I assume that is correct?