Before anybody can make suggestions it would be helpful if you could provide clearly the town location you are considering as your departure point for the islands and for storage .
If you are going to an island in a small boat you will also be returning the same way. It is a good bet that you will need a hotel on the mainland the night before setting off, so turn that to your advantage. Find a hotel with a good secure parking area , then make a deal with the hotel to leave your bike parked there until you return. Better yet on your return stay there another night. Very probably the hotel will appreciate your business .
You understand though that the hotel can not be held liable for any damage or loss that may occur, they are not in that kind of business.
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