Things to do in Delhi :-

1. Must try out street food from chandichowk, bengali lane , lajpat nagar etc.

2. Visit some of the most heritage monuments like sunder nursery , Safdarjung tomb , india gate , lal qila etc.

3. Try to act like a local to get some goood discounts.

4. Do some street shopping from local markets like Sarojini, janpath , lajpat, khan market.

5. Travel or commute from delhi metro to save your money.