They close off some areas, but most are left in a winding path around the whole zoo. If your kids are little, I highly recommend a stroller because it is a long trail. The zoo asked the locals to donate jack o'lanterns to line the paths. Music and spooky lights make the theme complete. Candy stations along the way kept kids moving.
The indoor Amazon section was very nicely draped with spiders and webs. Just outside they had free facepainting (they asked for donations). Very cleverly they would stamp the outline on the cheek and them paint it in.
The pavilion field had four inflatable bouncy gym thingies. Staff members very kindly let Nicholas go to the head of the line after he had to leave it to go potty. There were also several snack stands along the way, and the main restaurants were still serving.
Along return of the loop were the Frog Prince and his Princess, an Egyptian tomb with a mummy, and (the kids' favorite) a pair of grumpy trolls with their hut under a bridge walkway.