Pretend that I have a mySQL database with a bunch of amusement park data. (entrance, food, beverage, ride stats, etc) Has anyone plugged some data like this into the amazing front end reporting that Piwik provides?
I know it’s not web data, so I’m curious if anyone has experience here. Or maybe this idea is documented somewhere?
Yes we have done some things like this, and would like to work on this kind of features further, but we miss time and funding. Piwik tracks people & actions with custom values. Pretty much anything can be mapped and this is also an ultimate goal. Get in touch if you can help us!! 
That’s great to hear this is something your team thinks about. Where would be the best place to get started on something like this?
The idea that I have in mind is to compile some data on Fantasy and give a fantasy league some ability to run reports on certain players / teams / match ups / years, etc to try and uncover so cool insights. I’m hoping the Yahoo or ESPN API lets us plug into that, but right now I am interested in just playing around with some dataset that I have. Once I get that prototype working, I’ll be more than happy to express my interest level in contributing to the project!