A private island on Annabessacook Lake for weddings, family reunions, retreats, or big gatherings. Sleep in whimsical stays, eat under event tents, paddle pristine water, and reset together in nature. Bring clothes, friends, off-leash pups & lots of food. We’ve got the rest: easy transport, comfy-real-beds, cooking options, hot shower & super clean, Maine Guide hospitality. All levels of nature lovers.
Helpful Guides
Fourteen acres of island, five off-grid stays, endless ways to reset.
Two event tents. Room for 50 hungry, happy humans.
Lunch, served up in the trees.
Fourteen acres. Six stays. Hot showers, sauna, swim docks, hammocks, and space to celebrate.
The Nautilus Waterhouse — not just by the water. On it.
The StarGazer - Sleep between the Lake and the Sky.
Treehouse quiet hits different.
Setting the stage for ‘I do,’ island-style.
Easy to get here. Hard to leave.
Loon Point — where loons set the schedule.
Bring your crew. Unforgettable happens naturally.
Compare all of our eco-island stays.
Wood stove warmth, dog-approved. Firewood included. *WST
Lakefront days. Beachfront wandering.
Event planning should feel less like herding cats and more like launching a small, cheerful expedition. Our event console quietly handles the guest lists, schedules, and logistics so you can focus on the part where everyone actually has a good time.
A cozy sleeping loft in the A-frame.
The island doesn’t rush sunsets.
Four toilets. Yes, they’re composting. Yes, they're nose-friendly.*TLT
Arrive by floatplane. Island bragging rights included.
Island docks for every stay. Bring a boat. Bring five.
Berry the Bass was briefly unavailable.
Every guest gets their own little command center for the adventure ahead. From ferry choices to what they’re bringing for the potluck, it’s a simple place to get organized before the island comes into view. 🌲🛶
The Hot Showah.*HSH
Reception refreshments.
Front porch. Open water.
"Naycha" up close...
A private island means leash-free heaven.*NOP
Arriving and departing are part of the adventure.*CHO
Smooth water. Paddle freedom. Sunshine included.*EXP
Hot sauna. Cold plunge. Repeat.
S’mores happen naturally here.
Gather ‘round. The fire’s on us with free firewood.*PIT
The fish like sunsets too.
Island treasure map.*IMP
Connected if you want to be. Pretending to be unplugged is also allowed.*INT
You are here. Adventure nearby.*LMP
We get all sorts of visitors.*TRT
An island wedding reception — love, laughter, lanterns.
The stars show up here.*MTR
Meet your new timekeeper.
Room to dance and celebrate. Special gatherings welcome.
Paddling gear included. Dogs welcome. Involuntary swimming possible.*BTG
Hammock docks do the work. You do the lingering.*HAM
Fish with your bestie.*FSH
Mulitiple grills means cooking inside or out. Tools included. Recipes optional.*GRL
Sometimes, the sky shows off.*NTL
Off-grid stays, done right. Tent, dome, cabin, A-frame, houseboat, treehouse — your pick.*SLP
Everything you need to cook. Bring food not gear.*KIT
Nature rewards patience. Worth the rain.
This place feels far away. It isn't.
Loon Point was named by the locals.
Guest Reviews from Revyoos — Showing 7 of 47 Reviews
The Oaktagon Tree House on 1 Big Sustainable Island is amazing! The whole island is so cool. The accommodations, trails, canoes, sunrises, sunsets, the peace and quiet of nature all in one package. Kent is a great host. From the ferry ride out to the ferry ride back in, he has everything thought out for you. All you have to do is relax and enjoy. It was well worth the trip from California and got our vacation off to a great start.
So glad this magical island is open to the public / renters are welcome. Don’t miss an opportunity to hike these clean trails or stay in one of the beautiful rentals.
Great place to get away. Everything was well planned and thought out. You are taken care of.
Beautiful and peaceful.
We loved our time on the island! We stayed with two other families the last week of July-which turned out to give us three days of very different weather. We loved going down to swim, fishing, and exploring the flora and the fauna. We appreciated how attentive Kent was to getting us ice, checking in on us, and teaching us about the island and the area. We got our fishing licenses and the guys spent many hours fishing anywhere they could. If you travel during these times in the future you may want a small portable fan. Our 1 year old especially loved any visits from the dogs. Upon returning to our home in Ohio, our 4 year old declared "I don't want to live at our house, I only want to live on the island!" Thank you for sharing this beautiful place!
Words don't describe how awesome 1 Big Sustainable Island is, and the people who run it. This fully sustainable 14 acre island was so relaxing and fun to stay at. We stayed in the A Frame and for four people it was an affordable escape. Some of the best parts: boat shuttle to the island by the owner who talked to you about the entire lakes history. The compostable toilets, rain barrel pump sinks and shower, are luxurious for camping and are actually truly sustainable (no greenwashing). Free firewood, canoes, and fresh water at your disposal. The trails around the island are fun and you definitely have to use the rope swing. Remember, when here to follow leave no trace and sustainability guidelines. Do not leave trash and respect all aspects of nature to keep this place wild and sustainable.
Events: Weddings, Families, Retreats (whole island) - FAQs
Can 1BSI host weddings and large group events?
Yes! Our island has hosted weddings, team retreats, training workshops, and multi-day gatherings with logistics support.
What group sizes can you accommodate?
We've supported groups as small as 10 and as large as 85 for retreats, ceremonies, and corporate events.
Is event catering and vendor support available?
We can assist with coordinating caterers, stylists, and other vendors - just ask us as you're planning.
Ready to plan your overnight island stay?
Bookings go fast in peak season. We'll help you pick the right spot.
