Swimming conditions at Kaiji Beach vary considerably depending on weather and season. The beach is relatively exposed to ocean currents and waves, making it less ideal for swimming compared to other Taketomi beaches. Strong currents can develop, especially during changing tides or rough weather. There are no lifeguards or safety nets on duty. Most visitors come for the scenic beauty and famous star sand rather than swimming. If you do swim, stay close to shore, avoid going out during windy conditions, and never swim alone.

The best time to visit Kaiji Beach for star sand hunting is during the dry season from October to April when conditions are most pleasant and beaches are less affected by storms. Star sand is easier to spot during low tide when more beach is exposed. Visit on clear, sunny days when natural light makes the tiny star-shaped particles more visible against regular sand grains. Early morning or late afternoon provides better lighting angles for photography. The star sand is present year-round, but weather conditions affect accessibility and viewing quality.

Kaiji Beach is located on the northwest coast of Taketomi Island, approximately 2 kilometers from Taketomi Port. The most authentic way to reach it is by renting a bicycle at the port, which takes about 10-15 minutes of cycling through the traditional village. Water buffalo cart tours don't typically go to the beach. Some visitors walk, which takes roughly 25-30 minutes. The path is relatively flat and well-marked with signs. Rental bicycles are inexpensive and readily available near the port, allowing you to explore the entire small island at your own pace.

Kaiji Beach is undeveloped with no permanent facilities, restaurants, shops, or amenities directly on the beach itself. There are no restrooms, showers, or shade structures at the beach. Visitors should bring everything they need, including water, snacks, sun protection, and any beach equipment. Taketomi village, a 10-15 minute bicycle ride away, has several small restaurants, cafes, and shops where you can purchase supplies or eat before or after your beach visit. Plan accordingly as this is a natural, uncommercialized beach experience.

Star sand isn't actually sand but the tiny skeletons of microscopic organisms called Foraminifera, specifically Baculogypsina sphaerulata. These single-celled organisms create star-shaped shells with five to seven points, which wash up on shore after the organism dies. Kaiji Beach is one of the few places in Japan where star sand is abundant and easily visible. Finding star sand has become a popular activity, with visitors collecting small amounts as souvenirs. However, taking large quantities is discouraged to preserve this natural phenomenon. Look closely along the tide line for the best specimens.