Architecture school is very rigorous, and you won't have much of a life during your school years. Projects take much longer than you think they will - figure on two or three times longer than what you estimate. For the first couple of years, your work will all be done by hand (hand modeling and hand drawing). Draw everything and everyday, it is important to draw as much as you can. This will help you in the long run. The later years will introduce computer modeling. Learn how to render well; it is one of the most useful things you can put on your resume and in your portfolio.
Try to get as much work experience as possible, as soon as you can. An excellent place to work is at a construction company, as you will learn a lot about the buildings you are designing and will become a much better architect with that understanding. Make the best impression you can during your internships - you need to start building relationships/connections with people early on.
Develop an appreciation for art and influences outside of the realm of architecture. Try and keep an outside perspective, it will help open your mind to possibilities and shape your career.