I hope you have fun! Outside of Portland, I didn’t find the beer trail to be super exciting. Most places we went were just brew pubs, so it was odd (no tours, no tastings). A few places aren’t tourable, which was weird. One place was a “brewery” set in someone’s barn, they definitely didn’t want you showing up.
Bar harbor is very kitschy, so if you mind things like that, I’d stay away.