Yes, during low tide when the water recedes and exposes the beach. During high tide, the gate is partially submerged and inaccessible. Check tide schedules before visiting if you want close access.
No. The Itsukushima torii is in Hiroshima Prefecture and is much larger. The Futamigaura Torii is in Fukuoka Prefecture and is smaller with fewer crowds.
Sunset for silhouette shots, or early morning for softer light and fewer people. On clear winter days, Mount Fuji may be visible in the distance, though this is rare.
Parking, restrooms, and a few cafes are available nearby. The main Sakurai Shrine complex has a shrine office selling amulets. More facilities are in Itoshima city center, 10-15 minutes by car.
Yes. The beach is open for swimming during summer months, typically July and August. Swimming near the torii gate itself is generally discouraged out of respect for the sacred site.