I think a non fishing section is a good idea. I am currently the vice president of a online tractor club. We are a forum type club site like this. We have a few non tractor sections. We have a "coffee shop, for no tractor and non political topics. We also have a "Back Room lounge" for the political stuff. The tractor club is a paid club, only $10 a year, but we do have members from all over the world. I know it's not the same as this site, but if it would give you some ideas, please check it out.
http://www.simpletractors.com/club2/portal_content.asp
As a guest, you won't be able to see everything, but it should give you an idea. If you do want to see the full site, let me know, I mite beable to give you a user name and pass word to use temporarily.
Elon