Ganga is the holiest river. When you see the population density map of India, you will find how many people are dependent on Ganga. It has different names in others State. Rishikesh is that one place you would never get bored. You've visited almost whole india, now you can know how people,language, culture, dresses changes here. I'd suggest while you're in India, try to experience our culture it'll experience of lifetime. Best wishes