Hi,

This question is more so based on personal opinion. These are educational institutes so I am not sure of what you would mean. Moreover, what may be happening for someone may not be happening for you in terms of social life. 

IIIT Delhi has reportedly very good facilities as compared to DTU and NSIT. NIT Delhi also has good sports facilites. Most of these institutes boast of football, basketball, badminton courts as well as indoor games like chess, carroms. A gym also seems to be common. There are also clubs for various student activities.