Should I study Physics, Organismal Biology, or Neuroscience?

I am about to enter my first year of college, and I’m considering what major I should pursue. I know that I want to pursue the sciences, and I know that the fields of Physics, Organismal Biology (marine biology in particular) and Neuroscience all spark my interest more than anything else. I do not know very much about any of these fields – my interest is based on the bits and pieces I have learned, on perusing the course guide for the most interesting-sounding courses, and on a general aesthetic attraction.

What I will probably do is take the most interesting-looking introductory courses offered for each one and make a decision based on that. However, I would really value your opinion on the relative merits of these disciplines, just so that I don’t have to go in blind. Which will be most useful in the future (both career-wise and in relation to advancing technology and scientific understanding)? If you study one of these fields, why does it captivate you? Which of these do you feel creates the firmest foundation for further learning? Finally – is there some other field I haven’t considered yet which might bring these three areas together?