Students wise

Go to every orientation programmes
You should definitely go to everything they offer for new students. It's a great way to start to feel a sense of the place, to meet people, to learn your way around, to learn how the system works and to start to feel you belong. But , don't sign up for everything that interests you - you'll be overwhelmed by midterms if you do. Rest assured that all of that stuff will still be there second quarter/semester when you've had a chance to settle in and figure out how much time it's going to take you to achieve your academic goals.

Socialize
You're in a very unique position right now. You're legally considered an adult but you still have virtually no responsibilities and massive amounts of free time. Network with everyone! The people you meet in higher institution will be your friends for life. And it's the last time you'll be surrounded by so many people from so many different backgrounds. Socializing gets much harder after graduation and when you get a real job. Go to parties, just don't go overboard with the drinking

Get a hang of the college
Discover what's what and who's who. Find activities that are happening around that you might be interested in. You might end up finding what you really want to do in life . join tours such as mountaineering, hangout, walk through school, organized by clubs, fellowships etc, with this you will get a hang of the school and easily find your way around..

Be friends with your seniors
They are the most helpful people you can find in your faculty because they have been there and done what you might be thinking.. Don't get carried away though, don't be lured by seniors who don't have anything sensible, or useful to offer you.. Be friends with those who could help you in your academic, career, spiritual life etc..

Have a plan/schedule..
Don't get carried away by the freedom you just possessed, draw a plan or a schedule and follow it strictly, Time management is key. Too much study? Too much partying? Too many extracurriculars? Too much employment elsewhere? All will have costs. You need to be tough here and it's not easy.
Establish a good practice around studies, get your timetable, block out your week in a Calendar app including extracurriculars, any student employment, known campus events, games, shows etc., reading and reports time (Sundays, most students around will be doing this) and map out your time for socialising when you know your peers are too (Friday night, Saturdays most likely). Set up reminders on your phone for when you've to go to particular items. Include one spot in your week to review how you are getting on, Sunday morning is good for that.
Once you have a schedule stick to it, be ruthless on that with yourself and others who want to party when you need to be elsewhere. There is no catchup time, campus life is packed, you need to grab a hold of how you manage it.

Stay healthy
Don't misuse your new found freedom to the detriment of your health, Don't binge drink. Don't smoke too much pot. Avoid experimenting with drugs.

Sleep 8+ hours every day. You're expected to learn A lot in the higher institution . Being fully rested promotes learning and the formation of new neuron connections. You might get a lot of work done if you pull an all-nighter but you won't remember any of it a few months from now.
Don't use caffeine as a long-term strategy. Caffeine helps with focus in the short-term, but then you crash and become dependent on it for sustaining your energy. It might be useful during finals week, but avoid it if possible.

Enjoy your stay in school.

Some contributions obtained from quora

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