They tend to be very well-informed about college and departmental procedures and about the habits of the faculty in their department. Many perform yeoman service for you by typing and mailing important letters of recommendation. Note the lunch hours of departments you deal with frequently and avoid visiting then. If your professor or advisor leaves papers for you to pick up in the department office, go in the late morning or afternoon. Observe common rules of civility.
Academic life tends to endow the faculty with an authority that can be a bit intimidating.
But faculty members are generally plain folks. Exchange a little small talk with your advisor to acknowledge this human bond. Then quickly come to the point of your visit. If your and your advisor have time afterward, you might chat about hobbies, family, or impressions of Brown. Don't expect your advisor to solve your personal problems.