Solo travel in India can be fun, adventurous and amazing! Realize that much of India is still a traditional society, and in certain parts of society the genders do not mix. Err on the side of caution. As a tourist in India, keep safety in mind at all times.
During my time living in India for about 15 years (till I turned 25), I got to understand the country in a unique way. I found my fellow countrymen to be warm and big-hearted, but also traditional and dogmatic, almost as if stuck in the past. Every year, we would go traveling to some part of the country, and I got to experience many surprises, adventures and frustrations along the way.