The easiest option is to drive to Ardrossan and take your car on the ferry to Brodick which is only 2km from Quivive. The ferry is a very good deal now that the Scottish government has subsidised RET (road equivalent tariffs) to slash prices. If you fly to Glasgow airport, we would recommend hiring a car for the short 40km drive to Ardrossan, keeping the car for the duration of your stay on Arran. Alternatively you can catch a train from Glasgow Central to Ardrossan Harbour to get straight onto the ferry as a foot passenger. You could then manage on Arran without a car, as there is a good bus service, but we would recommend hiring a car in Brodick.