Is there a fee for someone to show up to visit someone that is camping if they don't plan on doing anything but to visit the family who is camping there?

Your reservation base fee includes: RV and Tent sites: 2 adults and your dependent children. Cabin and Tipi sites: 4 adults and your dependent children.  RV or Tent additional guests are charged a $4.00 fee for the day and $8.00 for overnight. Cabin and Tipi additional guests are charged a $4.00 fee for the day and $10.00 for overnight. Maximum number of people permitted on a site at any time is 7. Tent sites are not permitted more than 4 adults. Cabin maximum number of guests is specific to each cabin. Please refer to the website or call ahead to confirm the unit you have reserved will accommodate the number of people you are bringing.

No

Yes,

No. You can have visitors. It just can't be unreasonable

Yes, $4 per person.