If you are into shopping visit Lajpat Nagar , Karol Bagh , Sarojini Nagar these places will tell you exactly what street shopping is all about , shopping in the malls is way too common , if you want something new go and hit these streets , the amount of variety they have can't e found anywhere else in the country. If you want Costly Designers go to Shahpur Jat and Sultanpur for a unique experience.
If you think this is it then wait!
Delhi has a bird Sanctuary too , the Okhla Bird Sanctuary , for a weekend get away into the Nature , you can just take the metro to Okhla Bird Sanctuary and also the Aravli Bio Diversity Park.
If you want pubs and shopping , Connaught Place is the most central place in Delhi with so many options that you won't even be able to decide, trust me you will waste one hour roaming around and guessing what place would be the best one.
Night life , yes! it is so obvious the the Capital has the best night life you can imagine , There are a plenty of night clubs, although a litlle costly but they are worth it , my favourite is BW and there are many more options which can be found if you google them.
So guys, that is it from Delhi , although there is a lot more but i am keeping it for you to explore!