The idea of a "Living UI" as dubbed by the developers is a great idea that will help players see problems without searching through menus and text, here are my idea of some aspects of the living UI
Vandalism/Security
If some parts of the park are not well patrolled by security guards, some parts of the park might become populated with more shady characters, meaning less people in those areas and visible signs of vandalism. Guests will remark about not feeling safe and not going to certain parts of the park.
Gardening
Lack of handymen/gardeners in certain parts means that grass might get tall or flowers die/lose color. In RCT1/2 this was somewhat of a thing. I loved it when I saw handymen cutting grass and seeing this texture and guests will remark about the state of the park
Happiness
If the gusts are not having fun, you could have a slight grey tint/fliter of the screen, signifying there is a problem with happiness something like
If a rides to expensive or does not have enough money you could have the guest animate looking into his wallet and checking his money to then get sad because he doesn't have enough money, lowered head and leave the stall or ride, it will then add to his angry state if the guest is angry he might sort argument with the staff, this will make the others near him unhappy.
Vandalism/Security
If some parts of the park are not well patrolled by security guards, some parts of the park might become populated with more shady characters, meaning less people in those areas and visible signs of vandalism. Guests will remark about not feeling safe and not going to certain parts of the park.
Gardening
Lack of handymen/gardeners in certain parts means that grass might get tall or flowers die/lose color. In RCT1/2 this was somewhat of a thing. I loved it when I saw handymen cutting grass and seeing this texture and guests will remark about the state of the park

Happiness
If the gusts are not having fun, you could have a slight grey tint/fliter of the screen, signifying there is a problem with happiness something like

If a rides to expensive or does not have enough money you could have the guest animate looking into his wallet and checking his money to then get sad because he doesn't have enough money, lowered head and leave the stall or ride, it will then add to his angry state if the guest is angry he might sort argument with the staff, this will make the others near him unhappy.