I will be in Delhi next month. I wish to visit places in Delhi NCR and would like to know what all places I should visit. All I know about Delhi is India Gate and Qutab Minar, so I need some more information or more like a list or where I should go in the Delhi NCR region. It's going to be May next month and very hot, so although seeing things which are outdoors would not be suitable, I would still you to mention them, as I would probably consider visiting these places in the early mornings or late afternoon/early evening.
There is a similar thread about the places to visit in Delhi, so do have a look at that if you want to visit places on your own in your own time. If you wish to travel on a tourist bus then have a look at the thread about the Hop on Hop off Delhi bus thread, which covers a majority of the tourist places in Delhi.