A Staff Nurse could handle all non-fatal issues and injuries -- which could be broken into categories and clearly specified beyond "I'm injured and have a red aura and lying on the ground"... such as:
- Falling off a slide / diving board (the main current one)
- Slipping too hard (slips could have severity tied to them from mildly annoying/leave bad review, to annoying enough to immediately leave the park, to an actual concussion, which the nurse would handle)
- Nausea/vomiting
- Heat exhaustion/stroke
- Bruises from physical fights (guests could occasionally have altercations over lines, diving board access, toilets, stench from not showering, etc... as would happen in a real park)
- Allergic reaction to food
- Asthma attacks
- etc etc
This could give more depth to the medical bag in the office, which could be something you or restocker must keep regularly supplied in adherence with safety codes. (open a pharmacy for purchases)
Note, I'm NOT suggesting a nurse as a replacement for having EMS called and you being fined for them dragging a corpse out of the water. If someone drowns in the pool, that can remain an ambulance issue.