The Castle Rock Walk Flinders Island is one of Tasmania's Great Short Walks, it meanders along the shoreline of Marshall Bay, crossing stunning beaches and coastal hinterlands on its way to Castle Rock, a massive granite boulder. The 2.5-hour return beach walk begins at 'Castle Rock track and car park' just before Allports Beach, and near Allports Campground Flinders Island. Walkers can also begin at the Marshall Bay end via the Marshall Bay Access Track on the left off Palana Road just after the sealed road becomes gravel if you're coming from Whitemark. Park on the hill overlooking the Bay a five-minute walk along the dirt 4WD track on your left will bring you to Castle Rock. Toilets, picnic tables, free gas barbecues, and tank water are available at nearby Allports Beach including a designated camping area. Classified as a Level 2 walk moderate grade with no steep sections. Generally, a very safe walk, best at low tide, check the local weather for times, however, walkers should watch out for large waves during big seas if attempting the walk at high tide.