Planning a trip with the family 2 adults 2 kids during April vacation week. Coming in on Sunday til Thursday. Planning to stay in Alexandria hotel with shuttle to metro station. So my question is....what is the best way to pay for the metro? Buy tickets every ride? Trying to do this the most economical way. Also, if we get on at Huntington station is it a straight ride to DC stations? Never been to DC and so confused on how to get places.