What is a proper noun for theme park ?

A proper noun is the name given to something to make it more specific (e.g., Johnathan, Ollie, New York, Monday). ... Proper nouns contrast with common nouns, which are the words for something (e.g., boy, dog, city, day). Common nouns are written with a capital letter only when they start a sentence.

No, active voice would be “Will Byers filled the donuts with jam.”