Deer Isle? Why would you ever want to go there?
I'm not familiar with Corea and surrounding area- have been there a few times for boat-related business, but never to stay for long.
Deer Isle, however.... I've lived on the island my whole life, so feel qualified to respond here. If I were visiting, some possible activities (with drive time) might include (I would include links, but I think I am not supposed to...):
-Kayaking with Old Quarry Adventures in Stonington
-Viewing the lillies at Ames Pond in Stonington
-Swimming at the Lilly Pond in Deer Isle (because the ocean is so darn cold!)
-Mailboat from Stonington over to Isle au Haut for the day
-Eating breakfast with the local fishermen (early, though- 5 a.m.!) at the Harbor Cafe.
-Nature walks at many of the nature preserves and trails on Deer Isle
-Visit to Nervous Nellie's Jams and Jellies in Sunshine (an appendage of Deer Isle)
-Spending the day at Sand Beach in Stonington
-Attending any event at the Opera House. in Stonington- they offer frequent live presentations and current movies
-Tour of the Haystack School- and presentations are open to the public on certain nights
-Island Country Club for golf/tennis/shmoozing
-Visit to the Holbrook Island Sanctaury in Brooksville/Cape Rosier (30-40 minutes)
-Day schooner out of Harborside/Brooksville (30 minutes)
-Blue Hill (20-40 minutes) galleries, shopping, many concerts and activities. MERI (marine eduation) center. HIKING up Blue Hill Mountain- the view is wonderful!
-A day trip to Castine (1 hour drive time), which has Maine Maritime Academy (and sometimes the State Of Maine training vessel), the Wilson Musem, and many eateries, from dockside hot dogs to fine dining.
-Fort Knox in Prospect (1 hour away)- just a neat place!
-Ellsworth is about an hour away from Stonington, 45 mins from Deer Isle, and Bar Harbor/Acadia is usally another 45 minutes during summer.
If you have any specific questions, I'll answer whatever I can!