This is "Things that are not on CHB Official Map, but I am convinced are there: a list"
Here's the map for those who don't know:
One of those bike racks with free bikes/space for campers to put their own bikes
Basketball courts (I feel like I remember them playing basketball but it's not on the map, so, yeah) that double as a tennis/pickelball court (there's a detachable net)
One of those floating slides in the middle of the Long Island sound
A roped off swimming area in the sound/a swim dock
A zipline that you jump into the lake from
A high ropes course (this is just me projecting my love of rope courses onto CHB, don't mind me)
A few platform tents off to the side that are seldom used, but make a great gossip spot
At least fourteen tree houses
A random shrine dedicated to something extremely niche that has nothing to do with Greek Myths (an actor, a toy, or something like that)
A GIGANTIC world map where campers from around the world can stick a pin with their initials and cabin numbers where they're from.
A playground with a swing set, swings, spinny things, the whole shebang.
A dedication wall where all demigods who died in battles/quests are named since the dawn of time (the starting of camp) It's got like historical demigods like Achilles all the way up to modern day and the Battle of Manhattan and Gaea and Nero and such.
A second wall dedicated to roman casualties after the camps become friendly
A shed that's dedicated solely to things like hula hoops, jump ropes, and those spinny things around your ankles.
A random shopping cart in the forest no one really knows how it got there (dedicated to the random shopping cart I found behind the fence in my backyard once)
A library hidden underneath the Athena cabin
A music room hidden underneath the Apollo cabin.
A cacao tree no one, including the cacao nymph, knows how she got there, but it makes great chocolate
A maple tree dedicated to the Canadian demigods (they have a little plaque next to it signed)
An abandoned tent sight in the middle of the woods
A semi-abandoned cabin in the middle of the forest used for gossip sessions
A plot of grass everyone calls "Cartwheel lane" and tradition has it you must cartwheel across it. (People who cannot cartwheel must leave a singular wagon wheel pasta on the edge as a peace offering) (wheelies in wheelchairs are acceptable)
A fake garden with plastic plants that the agrarian cabins care just as much about as their real garden.
An American Ninja Warrior course after a Hephaestus kid got hyperfixated on it.
A little cooking shelter that Hestia often frequents
137 random stickers of Chiron stuck around in really random places, no one's quite sure who put them there.
A portal thingymabob that gets you to CJ or the Waystation in a jiffy.