Here is a list of ideas I've jotted down.
Tiny cabins
Safari tents on platforms: similar to this
Domes (similar to this:
LUXURY GLAMPING DOME! | Full Airbnb Geodesic Dome Tour!)
Tiny cabins and domes will have water/septic and therefore bathrooms and kitchens
Four existing cabins (all are 2 bedrooms/1 bath) : new flooring, fresh paint, updated light fixtures, bathroom vanities, toilets, and showers as needed, new furniture including mattresses
outdoor cooking areas/kitchens for tents
Possibly like this:
hot tubs for cabins and domes, maybe also tents
plethora of string lights - each site will have some lights
Ideas for large field:
group fire pit (in addition to individual fire pits)
bandstand
horseshoe pits
corn hole
ladder ball
kick ball diamond
Frisbee golf
volleyball
badminton
corn hole
Centrally placed (large field) big building that should have space for: (future build)
store (basic groceries, wood, ice, souvenirs, etc.)
restrooms and showers
laundry
linens/supplies
game room
Pond:
swim platform
beach umbrellas
lounge chairs
tables
Play Area:
kids obstacle course
tree stump checkers with stumps for stools
balancing beams using stumps and 4" x 4" wood beams
sand (or corn) box with diggers
swings
Basic campground things we'll need:
picnic tables
garbage cans
grills
Adirondack chairs
mower(s)
golf cart and/or ATV and trailer
movie screen
projector
Activities/Entertainment
live music
BBQ? - hire someone to do a pig roast once a month?
scavenger hunts
telescope nights
snowshoes ?
geocaching
splash pad ?
trebuchet ? - launch pumpkins in the fall
Scheduled Activities
Bingo
Candy Bar Bingo
ice cream night "Make Your Own Sundae"
Hot dog roast night - provide hot dogs
August - corn roast
October - pumpkin painting
Face painting
Slip 'n slide Day(s)
Chili cook-off
Lots of ideas that'll take time to actualize.