Should I major in zoology or marine biology?

I want to go to the University of Hawaii: Manoa and I am having a hard time deciding between a major in zoology or marine biology. Is it possible to do both? Some people have said that it is better not to specialize too early, to go with the broader major and wait until graduate school to specialize in a certain area of biology or zoology. Also, what other majors would go well with a major in marine biology, wildlife biology, or zoology? And how difficult is it to get a well-paying career that allows frequent travel in one of these fields?