Did you ever consider renting a car and driving around yourself? We did a British Isles cruise several years ago and Wales was one of our favorite stops. We rented a car through Hertz right at the port and drove around ourselves. We went in June and it was very easy to get around. We found fantastic hikes (Rhoscolyn isn't to be missed), beautiful beaches and a little restaurant that served the best sticky toffee pudding I've ever had. Note: I tend to shy away from tours offered through the cruise lines and will instead either explore the port on my own or book private tours.