In reply to Mr Powly: Which island?
There are about 4000000000 islands off Finland. I was cycling in the Aland islands last August and there was a breeze all the time as the islands are quite flat and open. But I didn't camp, so not a proper test. The islands nearer Turku are more wooded. Don't know about the ones further north.
The Aland ferry is actually an E-road. It's the shortest crossing for a lorry route from Finland westwards (the other one goes to Rostock). There are 4 enormous ferries which all arrive in the tiny harbour at 14.15hrs, 2 from stockholm and 2 from Turku. And they all unload and go back out again in about half an hour.