There are various things in Delhi which people claim you have to do but it really wouldn't hurt to miss them. I'm sure you come across posts which speak about under-rated places and tell you what you should be doing, but this post is dedicated to what you shouldn't be doing if you come to Delhi.
1) Chandni Chowk - The Parathe Wali Gali at Chandni Chowk is highly marketed but people often forget to speak about how unhealthy the food is and how the food is gleaming with so many mosquitoes. It really is very over exaggerated. Frankly, when I went to Delhi, I didn't eat at Chandni Chowk because the food was very unhygienic and I lost my appetite.