Gilroy Gardens Family Theme Park | 874 followers on LinkedIn. Where fun grows on trees! | Gilroy Gardens Family Theme Park is a 501(c)(3) nonprofit corporation and California’s only horticultural theme park. Founded by Michael Bonfante, the park offers a unique family experience centered around trees and plants with an emphasis on local history. The park’s mission is to offer safe, clean, family entertainment in natural landscapes while educating guests on the importance of horticulture, agriculture, and local history.