Here is a (small) list of things you shouldn't do if you are actually scared:
Don't let your name go public - As per mentioned by TombRaiderFTW earlier, name-calling serves a completely different purpose in the vein of a haunted house rather than anywhere else. Much like living in an apartment, the walls of a haunted house are paper-thin and sound travels extremely quickly from one end to the other (the lack of a roof directly over the maze's walls is the main culprit of this). Case in point, when someone's name is called out by a scareactor, everyone else can hear it and follow suit. Name-calling adds a level of personal terror, as you feel like you have been singled out from your group and the monsters will make a bee-line for you. This works to a lesser extent in the streets, as you have hundreds of people and many more noises bouncing off all over the place, but is still a formidable way to get under someone's skin if you know what their name is.
Don't "act" scared - This is the hardest rule to follow if you are actually scared. There are many ways to tell if someone is scared, from both an obvious and a subtle standpoint. The one screaming at the most insignificant thing and hiding behind their significant other? Obvious. The one with a barely audible whimper and quivering lips? Subtle. The less obvious notions you give off, the less you'll stand out from the crowd. Hence the reason why monsters will go after the group of tweeny-boppers that are climbing over each other instead of the lone couple casually strolling through.
Don't run - Not just from a safety standpoint, this is the absolute easiest way to get a monster to not leave you alone. A good monster doesn't initiate the chase, because it is the guest who initiates it themselves. It's the most basic primal instinct amongst the "prey" when they notice something is amiss and take off prematurely. So if you see a monster at the end of the street, don't give in to the flight (but definitely don't go for the fight), or you risk being the source of one wicked chase sequence straight out of a horror movie.
Don't be the middleman - You've seen/heard the commercials about people eliminating the middleman to pass savings directly on to you. Well, in this case, both the exact same and the exact opposite can be said when being in a group in a haunted house. One of the most important rules of being a monster in a haunted house is to always scare forward. Houses need to get as many people through in a certain amount of time, and line backups hinder this greatly. Hence monsters scare the middle or back of the group to push them forwards. This actually makes things easier for the monster because where do the most scared people in the group go to? You guessed it - the middle. Thus, aim to be the first person in line or be as close to the front as you can.
And finally:
Don't let your guard down - This goes for everyone, not just the ones who are actually scared. Kings Island is just one big distraction, an instrument designed to get people to look at everything except what's in their immediate surroundings. One second, you look up at Diamondback's 230 foot first drop, the next second, you look back down to find a monster three inches from your face. The creepers are the most notorious at scaring people when they're not expecting it. Just like The Spanish Inquisition, nobody expects someone to come sliding right in front of their feet...especially in a big crowd. So always keep your guard up, but not to the point where you'll point out one monster and keep him away from you, only to have another one come up and scare you from behind (another fine example of killer teamwork).