1) Do a lot of everything, so long as it’s legal and relatively safe.
2) Nowhere else in life will you be around so many different people with such diverse and similar interests at the same time. Reach out to people; you will make lifelong friends and grow tremendously during this period.
3) Don’t take college for granted. It will pass you by before you know it, and you can never really go back to that stage in life without feeling awkward.