Would be a great idea to create a 'Silent zone item" Much like the cooler and heater / speaker items, but instead all animals inside the "silent zone" radius get reduced stress levels and guests quiet down. It is quite annoying having to place Multiple "be quiet signs" with not knowing, what areas are uncovered and where guests become loud again. That is why I think having a "silent zone" item, will be much easier to use and save a lot of time for creators.