I did whatever was easiest for me. Philosophy was the path of least resistance. I wanted to major in psychology, but it was too annoying at UC which is generally all about research. The problem now is that I have a degree and it all felt a bit pointless.
I'd figure out right away whether you're leaning towards obtaining a BA or BS. Humanities generally don't have to decide right away, but if you're leaning towards science you need to focus on it more. A lot more. The one thing I wish I would have done is go to the professors' office hours when I was fulfilling my breadth requirements and talk to them more. Not just about the present course, but what they found interesting in their field of study. Most people don't realize that your professors can be your greatest counselors. In my experience, the classes aren't what's valuable from college; it's the opportunity to sit down and talk to some of the most intelligent, committed, people you'll ever meet. And they generally love it when you take things further than what's being presented in the course.
It also helps if you're a major procrastinator like I was, and can often be the difference between a B and an A. Especially in the lower division classes where they know everyone is forced to be there. If you come to office hours at all they tend to adore you, but you might catch a bit of their passion if you come talking about theories and their own work.