We had a wonderful time on Great Diamond Island. Once we walked into the house we felt at home. Everything was there that we needed. Water was to cold for swimming the beach is a 1 minute walk from the house. We can't wait to go back next year and use the kayaks.
People were extremely nice on the island. I went running several times which was a great way to explore see both sides of the island.
The house is a 5-10 minute walk from the ferry. Going to and from Portland was easy you just have to plan your day around the ferry schedule. The owner was available to answer questions.
Basically we can't wait to go back next September.