First-I hope you found lodging.
I went for my first visit last year on 6/22/23 - it was a Bluebird Day- and I’m hooked. It's a total immersion of sight and sound of a an amazing nature experience. This year I wanted to see them bringing in feed for the chicks, so I have two dates 7/10 and 7/24.
I have a suggestion. On the island was a lonely male Gannet on his nest looking for suitors. Because the Puffins and Razorbills will be plentiful and easily shot in any Blind- I will research which blind will give the best views of the Gannet I was in Blind 1 and had views of this beauty, but Blind 2 had better views. He was an unexpected gift.
And if your coming this way and your thinking about night skies- you should try to visit the Bold Coast Trail. It is one of the best spots for night sky photography. Not to mention, the 30-40 minute easy hike to the coast will give you the most spectacular coastal views in the state- bar none. You will not be disappointed. Amazing cliffs- aqua blue sea without the throngs of tourists clamouring in your shots. And . if you hike all the way out, there is a campsite that is a premiere night sky destination.
Bold Coast Trail check this link.
As for Quoddy- it is not locked up at night. I've been there for Sunrises, but never at night. I don't believe it sb a problem.
And if it rains or is a heavy surf day- check out Jasper Beach in Machias. It's a stone beach and listening to the cascading polished stones is ethereal.
And lastly- if you stop in Acadia- Google Ravens Nest.- amazing views towards Cadillac especially at sunset. It's on the other Acadia on Schoodic Peninsula which is a great spot for stormy seas.
I shot my Z 9 and 100-400 and it was perfect for the Blinds. It's versatility for close tight shots was amazing, I would advise against using longer lens because of minimum focusing distances. You will not want to waste time swapping lenses. If you have two bodies, that's a different story. I did wish I had a longer lens when shooting from the boat- 400 just wasn't enough. I have the 800 PF and may bring it for the boat shots and change to the 100-400 when landing . BUT - I am considering getting the 180-600 if it becomes available before July.
You will not need a tripod or monopod. It takes up too much space and the openings will give you all the support you'll need.