To Sua Ocean Trench is a unique natural wonder in Samoa, featuring a large, swimmable sinkhole connected to the ocean by an underwater cave. The site is open year-round, but the best time to visit is during the dry season (May to October) to avoid heavy rains. Getting to the bottom requires descending a long, steep ladder, making it unsuitable for those with mobility issues. A visit typically lasts 1-3 hours. While a guided tour isn't necessary, local guides can provide insights into the area's history and geology. The entrance fee is approximately $15-$20 USD. Consider bringing reef shoes for the rocky terrain and be aware that the ladder can be slippery.