There are several things you can do on your weekend
If you are sports person you can play any sports in campus ground or any other local playground and believe me playing sport with a view of mountains is really awesome
If you are a mountain lover then you can for tracking and also short walk with friends in nearby areas like doonga ,kandoli and there are some more small areas for friends time
If you have a vehicle then you can go for a weekend road trip with your friends to mussorie ,ponta sahib and some more hill station near Mussourie and in winter you will find snow fall near Mussourie hill areas
And a combine plan for all the category is that you can go with your friends in nearby cafes or mall like Pacific Mall to watch movies and eat at Dominos or KFC for Nov veg lovers as you are not able to find Dominos,KFC,McD and more famous outlet near UPES that going to eat with friends at such outlet is also a short trip with lots of fun