UPES is surronded by Natural Beauty all around and well developed infrastructures which make it stand at top 15 most beautiful campus in India list. You can read this answer for more insight.
Campus has a rock muesuem, Oil rig zone(only campus to have) , MIG and many more things.
Food court, Nescafe area, amphithetare and Library are some prominent place where student usully spend their leisure time. The best part is the interaction and relation between seniors and juniors, Seniors are always ready to help their juniors out.
You may always find some or other activity going in campus, whether its preperation for upcoming festivals of different chapters or prepartion for any cultural event.