I'm planning a family trip to US (from Europe) and although we're going to stay in NY most of the time, I'd like to go to Washington DC and around for couple of days for example. I assume renting a car is the most suitable option here, but when I sum up all the costs (car, gps, 2x child safety seat) the price becomes not that compelling.
Is there any other way to travel at a reasonable cost with whole fam? Or which car rental company has the best prices for this kind of travels?