Hello - I will be coming from Australia early next May to pick up my daughter from university before taking a road trip together. We will be hiring a car and we want to spend 5 weeks starting from Iowa and finishing in NYC in early June. We want to drop into Canada for a while and also would like to include Philadelphia, Washington DC and Boston as well as plenty of interesting places on the way. We do not want to just stick to the major highways all the time. Does anyone have any suggestions on routes or "must do/see" things and places?