St Mary's Island Beach is a tidal beach surrounding the iconic lighthouse. While swimming is possible, it's crucial to be aware of the strong tidal currents, especially around the causeway. Lifeguard services may be present during peak seasons, but it's not guaranteed year-round. Always check tide times before visiting to avoid being cut off, and exercise extreme caution when entering the water, particularly with children.

For the 'Best Weather' and to fully enjoy the island and beach, visit during late spring, summer, or early autumn. To experience 'Less Crowds', consider visiting on weekdays, outside of school holidays, or during off-peak hours. It's also essential to time your visit with low tide to access the causeway to the island. Early mornings can offer a serene experience and great photographic opportunities.