Join No one has everbecome poor bygiving Memberships Individual One named adult. Dual Two individuals, one must be named. Family Two adults in the same household and their children ages 21 and under. One adult must be named. Grandparent Two adults in the same household and their grandchildren ages 21 and under. One adult must be named. Plus Package* Admit a guest FREE everytime you visit! *Plus Package is only available to Dual, Family and Grandparent memberships Charity is a simple method to prove kindness.