Mandvi is a relatively small yet peaceful coastal city in Gujarat, India. It's reasonably safe for solo women travelers, as the locals are amiable and respectful. The city also has a low rate of crime. However, as is the case with any travel, it's always recommended to take reasonable precautions, like not walking alone at night in unlit or less crowded areas. Use your judgement while interacting with strangers, and always ensure that family or friends are aware of your whereabouts.