Apologies for butting in to your thread but I saw Paimpol mentioned... I was there about 4 weeks ago and yes it's a lovely town!
You don't say if you've been before, but make sure you time the tides right for the lock (about 2 hrs either side of high tide from memory - check this!) because if you miss it there isn't much water left and you'll have nowhere to go!
I took this picture looking at the lock entrance at low tide... note the keel marks in the mud!
The second picture is looking out to sea down the channel.
It can be a bit of a bun fight at the lock too so prepare lots of fenders!
Any other questions let me know