1 Big Sustainable Island

Events: Weddings, Families, Retreats

Maine glamping for large groups on Annabessacook Lake in Monmouth, Maine — near Winthrop!

Quick Answer: Events: Weddings, Families, Retreats is 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 on Annabessacook Lake in Monmouth, Maine.

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.

Guest Reviews from Revyoos — Showing 10 of 47 Reviews

Collyn Baeder September 17 2025
Rating: 5.0 / 5

Had a blast in a beautiful place! Everything is so thoughtful and well-organized!

Samantha Herrick September 12 2025
Rating: 5.0 / 5
Christa Bourque September 10 2025
Rating: 5.0 / 5

Ive been to 1BSI twice now. The First time with my husband we stayed in the yurt.. Second time was withmy 18 yr old son and 16 yr old niece. Both experiences were fantastic!! You literally dont not need to bring anything but your food and clothes. Everything is clean organized and well stocked. When you go the prepare to relax. Dont worry if the weather is great or if its storming. They have all you need to have a grwat time rain or shine!! Definitly will be going back agsin and again. Next time Im bringing my parents and the rest of my family. Maybe rent every place on the island !! Rates are very reasonable. Kent even gave an unexpected refund for my sisters stay. When she couldnt make it. Thanks Kent and Heather. Cant wait to book our next visit to 1BsI :)

Carrie Glenn August 31 2025
Rating: 5.0 / 5

Just came back from our second trip to naughty dog island and can’t wait to go back next year!

Jamie Wrye August 15 2025
Rating: 5.0 / 5

Since our first visit to the island in 2022(loon point) and our recent return 2025 (hemlock haven)- this has been by far the most amazing vacation. My husband and I have traveled all over the US, Europe, and had our honeymoon in Venice. The magic that 1 big sustainable island brings to your life, energy, and well being is absolutely priceless. Kent, heather and the pups as well as the reset crew are amazing. Every little detail has been thought of and executed. Everything is spotless and tidy. This is the vacation that we are constantly talking about- and by far my favorite get away. You won’t be disappointed!!!

Kurt Tommy August 14 2025
Rating: 5.0 / 5

Just finished our second stay at 1BSI, and it was somehow even more magical than the first. We stayed a the Nautilus (and Loon Point last time) and it was gorgeous, perfectly stocked with everything we needed, and just a wonderful experience for my whole family. Kent and Heather are tremendous hosts - friendly, helpful and brimming with information and help. Will absolutely be returning!

Charles Murnane August 03 2025
Rating: 5.0 / 5

⭐️⭐️⭐️⭐️⭐️🌠🌠🌠🌠🌠🌟🌟🌟🌟🌟 1BSI - This amazing escape/reset from life was an absolutely jawdropping experience. Kent and crew are so generous and thoughtful. Everything we needed was already there.. (even fishing rods and tackle) Sunset rock Waking up to sunrise in bed Private fishing deck, firepit, grill, patio Kayaking Canoeing Paddleboarding Hammock on the lake raft Emergency Hammock- especially for me I can't say how how pleased I was. The little things around the campsite were thoughtful and perfectly placed.

Andrea Duvall August 02 2025
Rating: 5.0 / 5

A fantastic destination for unplugging and getting away from the world (but with cell phone service!). A nature island experience with all the comfort and convenience in a sustainable way that made thess unique accommodations a truly incomparable getaway unlike any other. Definitely recommend!!

Paul Manoff July 31 2025
Rating: 5.0 / 5

My second stay at BSI last weekend was as impressive as my first two years ago. The island setting, the creative accommodations, and the owner's sterling customer service all support my highest possible rating. Paul in Westbrook.

Alice Blais July 14 2025
Rating: 5.0 / 5

Loved our stay here!! So relaxing, waterfront setting and very nice people on the island!

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.