Short answer
Visit on a Lan Ha Bay tour or private boat, around low to mid tide when the sand is exposed. Bring water shoes and a swimsuit, and expect company at midday.
01The place
Three islets stand close together, enclosing a calm patch of water and a short strip of pale sand. Because the islets block the wind and waves, the water is usually flat here even when the open bay is choppy, which makes it good for swimming and easy kayaking.
02The legend
Local storytelling links the three islets to three fairies who descended to the bay and stayed too long, turning into the rounded hills that look like peaches. Versions differ from guide to guide, which is part of the fun.
03Tides matter
At high tide the beach shrinks to almost nothing or disappears under water, while at low tide a wide spit of sand emerges. Good operators plan the visit for the right time; if you are hiring a private boat, mention it when you agree the route.
?Questions people ask
Can I kayak to Ba Trai Dao from Cat Ba Town?
It is too far for most casual paddlers. Take a boat with kayaks on board and paddle from there.
Is Ba Trai Dao crowded?
Around midday on summer weekends, yes. Mornings and late afternoons are quieter.