Well, your personal strengths and preferences aside, few Geography courses explicitly require Geography, although many consider it useful to have taken. Conversely, all Chemistry, Medicine, Dentistry, and Vet Med courses, most biomolecular oriented Bioscience courses (e.g. Biomedical Sciences, Biochemistry, Genetics, Neurobiology etc, etc.), and many Chemical Engineering/Materials Science/Bio-engineering courses require Chemistry. It's certainly useful even for those courses above that don't explicitly require it, and somewhat handy for e.g. Physics or other Engineering disciplines not mentioned above.
So, Chemistry certainly opens up a lot of options. However, if you're not interested in any of those areas, and are likely to do better in Geography, that's probably a better option. An A in Geography is better than a C in Chemistry at the end of the day. Is there a reason to not take both? Taking both Geography and Chemistry, alongside another science for example, would be a good background for most Earth Sciences type courses (including e.g. Geology, Oceanography, Environmental Science etc).