During college, I'd try and volunteer in a pharmacy. Maybe job-shadow. Find out as much about pharmacy as possible. It's probably good to do some other volunteer/club activities, too. Join a pre-pharmacy club if your school has one.
AP classes might help with getting into colleges. And they might also allow you to register for classes earlier (because the units may bump you up to sophomore status sooner). I don't know how important they are for pharmacy schools. Some pharmacy schools accept credit for non-science AP classes, but not for science classes. I'd check on some pharmacy school websites, but things may change by the time you apply anyway.
I took AP bio, and I found it helpful in my bio major classes. I also took AP physics, and while I re-took physics, it was nice to have the background. I didn't stress myself with 5 AP classes, like some of my classmates, but it's helpful having a couple. It prepares you better for college, too.