Penobscot Bay, Maine.

About half of the island is part of Acadia National Park, half is privately owned. You can make a day visit to the park end of the island by taking the mail boat from Stonington, Maine. Get the early boat, because you’ll want to spend the whole day there. Bring your lunch, water, your camera, good walking shoes and don’t forget rain gear. The trails along the coast are spectacular.
There are not many vacation rentals. The usual modes of transport are biking and walking. You can’t really take your car over there, although the residents do have cars (never inspected, but licensed). It\s also a splendid place to kayak, although the tides are pretty high (ten to twelve feet).restaurants, although you can get food at a concession next to the store. None of that is near the park end of the island.
When you make a day visit, you’ll get off the boat at Duck Harbor, the SW end of the island. From there you can hike several trails. Maps are available. My favorites are the Western Head Trail and the Cliff Trail. You get a splendid view from Duck Harbor Mountain. You don’t need a bike there; everything is within walking distance. Matter of fact, they don’t allow you to unload a bike at Duck Harbor. I think that’s to keep the visitors down at that end of the island. The road around the island is about 12 miles, but don’t do it; the trails are much more worth doing.
There is a campground at Duck Harbour.
The island has fewer than 100 year-long residents, many of them lobster fishermen. The summer population is much larger. There is a store and a school. The K-6 (I think) school is small, probably less than six students. There’s a tiny post office near the town landing

We’ve been there many times since about 1990. Ask me about it!

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South end of the island

Kitchen window

Surf at Boom Beach

Nice day on the Cliff Trail

Rainbow over Dolliver

Early morning, view to the East

Thunder Gulch

Quiet morning at Turner Cove

Boom Beach

Boom Beach, where it can be foggy. OK, it can be foggy anywhere on the island, and often is.

Fogbow in the late afternoon.  Similar to a rainbow, but the droplets are much smaller, so the diffraction diffuses then light and washes out the colors.

Along the Western Head trail