We are on a 2week trip to East Coast in August and I am flying into LaGuardia and back from there as well. Right now I am thinking that we do not rent a car while we are in NYC but we need to figure out how to haul a family of 4 (we have two boys 10 and 6 so its easy to manage buses/trains etc) from NY to DC and back. Amtrak seems pretty expensive. Any good bus rentals ? I'd probably need to rent a car when I am in DC but atleast we can avoid the driving in NY. So another option is just to rent a car from NY to DC and back.