Take Your Time

In movies and books that display the college lifestyle, typically things rapidly change from the high school lifestyle to the party atmosphere of college. In these movies, a basic student becomes king of the college campus, superstar athlete, and finds the love of his or her life within the time span of a year. In actuality, this doesn't happen, or at least not at such a rapid pace. College is a marathon, not a sprint. It is much more important to slow down and gradually adapt to the college lifestyle rather than rush in and attempting to try everything immediately.
Realistically, it takes about a year to adapt to what in a college environment. This time is where the habits that will stick around for the next 4, 5, or 6 years will be developed. It is much easier to slowly add more to your schedule than it is to be overloaded at the beginning and have to drop activities.
Many things about the "prototypical" college lifestyle can be delayed until one is comfortable. These things include relationships, pledging with a fraternity/sorority, joining different organizations in a leadership position, or just going out and partying. All of these things are integral to the college experience, however they should definitely be waited upon until one is ready to add these to their workloads.
Many people come into college planning on partying it up, and doing everything they have always envisioned when they thought about college as soon as possible. However, it is very important to take your time, and keep your grades up, to make your college experience the best it can be.