Boo at the Zoo is Thursday, October 31st from 6:00 pm - 9:00 pm. Great place to bring kids for a safe, fun, family environment. Come in costume and trick-or-treat at different stations around the Sanctuary with your favorite animals. Bring a flashlight and see all the nocturnal residents out and about! Special Admission Prices are $5 for HPZS Members and $8 for Non-Members.