Peta-Anne, I stand to be corrected on this as I have not been in Scotland for about 3 years, but Rothesay and Kingarth are on the island of Bute so you do need to take a ferry to get there. I would check with MacBraynes-Caledonian services who can tell you the details of the ferry services. There are two possible routes (1) by road all the way via Loch Lomond, the Rest and Be Thankful, Strachur and Glendaruel to Colintraive then by a short car ferry trip across on to the island at Rhubodach. (2) Direct from the mainland from Wemyss Bay to Rothesay - a longer sea trip but possibly quicker route. Caledonian-MacBraynes have a web site which gives all the ferry details. Sorry I can't give you the address but a search engine will find it for you. Wish I was going with you! My ancestors came from there too. All the best, Mary H