Finally, after some years of thinking about going on holiday to the US, this year it will actually happen. We will visit this beautiful country end of May, for 3 weeks. This is the (preliminary) route of choice:

We don't know exactly yet where we will start, probably Boston, but we want to finish in New York or Washington. We will mostly travel by car, but some parts will be done by train or bus.
Sure places to visit are Laconia NH, Boston, New York, Washington, Niagara Falls, Toronto, Pittsburgh and Lancaster.
Because I know that a lot of you have been to the USA already (multiple times), or in fact live there, I have a few questions for you:
- Regarding the arcade hobby, which places in this route are interesting to visit, besides Funspot of course.
- Which other places are a must visit, historical and cultural (f.i. museums, buildings, theatres) or nature wise.
- What are the best motel chains to stay for the nights (we won't book upfront)
- Any restrictions to travel from the US to Canada and back? With a rental car?
- Any great amusement parks en route?
- Cheapest places to buy electronics?
- Train or bus? (f.i. if we start in Boston, then we want to leave the rental car behind in Washington DC and travel further to Philadelphia, New York and back to Boston by train or by bus).
- Anything else which might contribute to a great holiday (the planning of it is already half the fun).