It's always a matter of situational awareness.
-Is the password widely distributed? At a campground that prints the password on every piece of paper distributed at the office? Or posted on a permanent sign outside the office?
-Is the password a tough one? Is it just the campground's phone number or address? Or some other common word?
-Is the campground located such that installation of a key logger would be possible or easy?
-Are the folks working at the campground office personally involved in setting up and maintaining security? Would they use it to pay their own bills?
:)
Lynn