Diamond Cove is an island resort community on Great Diamond Island Maine.
- The General Store: Located just steps from the ferry dock and marina.
- Marina: For overnight dockage at the marina in the summer, call 207-766-5694.
- Fort McKinley was the largest of five military complexes constructed in Portland Harbor in the late 19th and early 20th centuries. The fort protected Maine's principal city in one of the most well defended harbors in the country.
- Fitness Room- Located in the former Fort McKinley Post Exchange
- Maine Island Yoga- Located downstairs in the Admin Building.
- Rippleffect a youth and community development organization operating outdoor adventure programming out of Portland, Maine.