These guides (and there are lots of them out there) are mostly a means of putting together a bunch of ads with just enough actual motorcycling information to get people to look through them. There is some good information here and there and may be of some use to somebody unfamiliar with the region wanting to do the tourist thing. Still, this is another resource worth a quick look if a visit is planned.
Although not perfect, the routes, scenery, accommodations and places to eat on the New England Riders website are better than any commercial publication I have seen.
https://www.newenglandriders.org/BestEasternMC.htm
I was thinking about a New England run this coming weekend for a couple days camping near Gorham NH. Then I realized that it is Laconia bike week. Not sure whether the swarm will be spreading that far north or not. If I can find a spot, I expect riding on Saturday would be toward the west (to Vermont) rather than north-central NH. Anything south of North Conway will no doubt be totally inundated with pirates. Parade on the Kancamagus, anyone? I might be better off to go a bit further - Grafton Notch or Jericho lake...
(Fred, on your advice, I did the route 153 last year - can't believe I had not done it before. Very nice.)