Avoid the boats
Probably trying to get up high would be about the only alternative thing you could opt for. Maybe try some really awful weather for a properly scottish feel?
What about something more to do with the people of Mull? Now you're a bona fide portrait togist you could actually get into some cool places?
Also you should be banned from going to any of scotland apart from your house and your studio any more. It's too horrible sitting here and looking at your results when we live too far away to even try