Nusa Lembongan is considered very safe for solo female travelers. The local people are extremely welcoming and crime rate is very low. Public transportation is reliable and many places can be easily accessed on foot. Keep in mind the usual safety precautions such as avoiding quiet and dark areas at night and always letting someone know your travel plans. Practice good judgment and general caution as you would in any other destination. The culture is very respectful, making this a great place for solo female travelers.