Apparently the trick to this level is cutting off access to the ramparts until you have enough rides and stalls built so the guests don't get lost. I think it still happened to a few but stopped quick.
I saw tips on adding ATMs throughout the park as guests will keep spending money so did that as well.
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Note: I sped up the gameplay at the end because I'd been at it for over 90 minutes, I had enough guests/a high enough park rating and there was still like 4 months left. I figured that's enough time to catch if there's a rapid decline in guests and park rating.
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About the map
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You have inherited a large castle - Your job is to convert it into a small theme park.
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Objective
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To have at least 1,500 guests in your park at the end of October, Year 4, with a park rating of at least 600.
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Gameplay playlist - • RollerCoaster Tycoon C...
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Links
Blog - www.pateln01.com/
Website - headphonesneil.reviews