Ko Pha Ngan, is a popular travel destination that is generally safe for solo female travelers. The locals are often friendly and willing to assist should you need help. In addition, there's a good infrastructure for tourists, including reliable transportation options and accommodations. However, like anywhere, it's important to be cautious. Avoid walking alone late at night in deserted areas, and always be aware of your surroundings. Never accept drinks from strangers and keep your personal belongings secure. A little common sense goes a long way towards ensuring your safety.