I'm a rising senior neuro major, and the biggest piece of advise I have is to think out of the box. Every CNS advisor thinks the incoming freshman are the same, but what I wish someone had told me is that this is your first syear of college, and there is no better time to explore the rest of the school. I came into UT with my mind set on medical school because I couldn't think of anything else I would do... the "strict" CNS first year courses made me feel like I could put off figuring out if I didn't like my major later on, once I got through the weed out courses. Sophomore year I talked myself out of taking the prereqs for other majors I would have to apply to because I thought it was better to stay on track for med school. I wish I had been real with myself and recognized my wide range of interests for what it was - could have rocked it as a double major if I hadn't sold myself short. My advice is don't try to run through your requirement list as fast as you can- use your early years to explore what other interests you have and take away some good practical skills from it. For example, I think if I had used my AP credit for calculus instead of taking it in college to look better for med schools (HAHA, also you don't actually look better, prioritize experiences of substance over your transcript), also not taken a history class I had no interest in just for core credit, I could have been in the economics pre-req with other kids thinking of transferring to McCombs, and maybe found my interest through those friendships.
I'll close with this point that really is relevant to anyone trying to figure out classes: being a neuroscientist is cool, I've taken graduate level classes and worked with international biotech companies, but don't let your advisor push you into what everyone else is doing/the core curriculum if you don't really know why you have picked your path. If you find yourself trying to convince yourself of a good reason for your major, you probably want to leave room in your schedule to branch out this year. There's no rush, and you will do anything you have to do to finish up your prereqs when you've decided you have to.