Shell Island has three bathing beaches. Two small bathing beaches that are only available when the tide is out and the main Bathing beach at the south end of the 'Island' that runs for 6 miles down to Barmouth. The South bathing beach is backed by some of the tallest sand dunes in Wales. The North beach is known as the dinghy beach as it is possible to launch small dinghies from here.
The small central beach is the quietest and nestles amongst the rocky foreshore unnoticed by most people. In high summer these bathing beaches are probably the most popular private beaches along the coast. The shell beach runs for most of the length of the 'Island'. The rocky foreshore helps to retain the shells from being washed further along.
The Estuary is a varied beach made up of mudflats, marsh, and streams. It becomes a popular place for children to explore. Fishermen, find bait. Ornithologists discover the area is rich in bird life.
When the tide is up in the Estuary, it is ideal for sailboards, canoes and dinghies.