So I just learned and was reassured that nothing bad can happen in your AC NL town basically. IF someone does do something you don't like you can flip the wifi switch and revert everything to the way it was before the visit, which is extremely reassuring! In that case, I want to gain as many friend codes as possible to add to my game so that I can easily find a town to visit, or someone to visit mine when I want to, instead of being disappointed all the time that nobody is online. Wee! 
