My experience is 5 years old, so road conditions may have changed. We took route 1 from Bar Harbor to cross the border at Calais/St. Stephen. At that time the road surface east of Machias was in poor condition. It may have been paved since.
An alternate route would be to take route 3 and 1A to the junction with route 46 a bit east of Bangor, then go north on 46 to route 9. When we came back 5 years ago route 9 had been newly paved and was an easy drive.
Route 1 in New Brunswick was partly 2 lane and partly divided highway. They were constructing more divided highway at the time, so surely more miles of that now.
There are no mountains on these routes.
To get to Hopewell Rocks, you can either drop down from Moncton, or take route 114 through Fundy NP. Don't know whether you have to pay the entry fee just to drive through Fundy.
Try to catch both a high and low tide at Hopewell. The tidal range there is amazing.
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