https://www.amtrak.com/content/dam/projects/dotcom/english/public/documents/Maps/Amtrak-System-Map-1018.pdf
So, I can start from Toronto (one of three points where Amtrak enters Canada) and easily hit Boston or NYC in one shot. From there I can travel up and down, all the way down to Florida (where I have a friend I want to visit for a couple of days).
I think that would be a good way to get familiar with Amtrak, before trying a more westward excursion. The only problem for me is that making a bunch of short stops means not sleeping on the train, which adds up the expenses. If I count on sleeping on the train I will get most of the trip over without stopping anywhere. The cost of the train, even a bedroom, is not an issue, but a lot of tiny hotel stops could make it prohibitive, so I need to be picky. I would definitely want to stop at a few big centres and at least take a few pics before moving on, and a few smaller spots too, just to sample a few diners along the way. I've never been to Boston. I've been to Manhattan several times, but I also have a friend there so it will probably get a visit from me too. Philly and Basltimore might be likely targets, and maybe some others between there and West Palm Beach FL.
AND SO....
Who lives along that eastern train corridor and wants to buy me a cheesesteak sandwich or something, if they get a chance?

No point in my being coy, is there?
Recommendations for B&Bs and cheap hotels are always welcome too.
I'm thinking of bringing my electric bike, since Amtrak encourages that, but I'm not sure how useful it would be, and could easily become just a burden if I don't use it.