Me&my wife want to come to the states at the last week of March for 18 days.
In this time we want to travel in the Yellowstone park. in the other days we want to make the route from Chicago-Niagara falls-Boston. If it's possible we like to fly to Washington DC.
What I want to ask is : what is the best route for us? it is possible to combine all mode of transportation (flights,car,train...). if is there other things to do in this area?
If it's better to travel in the Yellowstone at the end of the tour, we don't mind. we also want to know where is the better place to get a flight for starting the trip.