I tested out of all the basic science and math courses at the college level due to the science prep in HS. I went straight into 2d and 3rd year courses. I used the extra time to take some fun courses in science and engineering.

The other benefit was that I learned to manage my time and how to study. Kids taking it easy will have a MUCH harder time in college.

A string of 5's in all your AP classes is not that hard to accomplish, but it does take a lot of work. It is a worthy goal.