Rangiroa is generally a safe place for solo female travelers. The people are friendly, welcoming, and respect tourists. Crime rate is low, but general safety precautions such as not leaving valuable belongings unattended should still be taken. It is advised to respect local customs, dress appropriately, and use reputable tour companies while exploring. As it's located in a remote area, it may be wise to share your itinerary with someone you trust back home.