What if I don't want to give house guests wifi access?
Why don't you want to let your guests use your wifi?
Why not? They will have to figure out other things to do.
Sharing access to your wifi is optional, and it's okay if you don't feel comfortable trusting other people with access to your network.
I might be a bit paranoid and stuff but that doesn't mean you need to talk about it and make it clear to everyone.
It's completely okay if you feel more comfortable by keeping your internet password secure. Some carriers have the option of creating a temporary guest network, you can always see if this is a good fit for you.