The Center for Environmental Education is open from 8 a.m. to 5 p.m., every Saturday and Sunday, through Sunday, April 28; $7 per vehicle. Unless otherwise noted, activities are free with park admission; call 895-2425 for reservations. Saturday, March 23, at 9 a.m., Gaston Meloche guides a 3 to 4-mile hike; call 638-5404 for a reservation; and at noon, bat biologist Ronnie Sidner presents a wildlife program in the Kannally Ranch House. Sunday, March 24, at 11 a.m., wildlife biologist Jessica Lamberton-Moreno presents an illustrated talk, "Wild Cats of the Sky Islands"; and from 1 to 3 p.m., Val Bembenek gives a workshop on how to make three kinds of blank journals; $12 includes park admission. Tours of the historic Kannally Ranch House take place at 10 a.m. and 2 p.m., every Saturday.