Yes, you can easily drive around the Isle of Arran in a day, as the main "string road" and coastal loop cover approximately 56 miles (90 km). A non-stop drive takes about 2 to 3 hours, but to truly appreciate "Scotland in Miniature," you should budget a full 8-to-10-hour day. Starting from the ferry terminal in Brodick, you can head north to see the spectacular Lochranza Castle and visit the Arran Distillery. Continuing south along the west coast offers dramatic sea views and a stop at the Machrie Moor Standing Stones, which require a 30-minute walk from the road. The southern end of the island features the charming village of Blackwaterfoot and views of the Holy Isle from Lamlash. It is essential to book your Caledonian MacBrayne (CalMac) ferry from Ardrossan in advance, especially during the summer months, to ensure you can get your car onto the island and back within a single day.