We live in Maine and travel often to the northern Virginia area west of Washington, DC. Our favorite route is 295/95 through Maine and NH. Through MA we take I-495 to I-90 W (Mass Pike) to I-84 W. We stay on I-84 all the way to Scranton, PA where we take I-81 S. We turn onto I-83 and US 15 near Harrisburg, PA, but since you want to continue on to Florida, you could continue south on I-81 and then take I-64 east to get back to I-95 near Richmond. That route goes further west so its longer, but Virginia is pretty. You'll have more large truck traffic on that route, but you will miss, NYC, Philadelphia and Washington, DC. Hartford, CT can be congested if you hit it during rush hour.
