This year's event includes several free activities for children, including: archery, fishing for catfish, BB gun range, bug sweeping, microscopes, touch tanks and reptiles. Adults and children can both enjoy the very popular "Birds of Prey" show by EarthQuest as well as the butterfly encounter tents. Refuge tours given by qualified naturalists can be enjoyed by marsh buggy or wagon. Guided walking tours to Bobcat Woods and to the largest Texas Live Oak are also available. All the photo contest entries can be…