Sec. 54-40. Prohibited acts...
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(19) No person shall bring into or have in his possession in any park area or facility any firearm, BB gun, air pistol, bow and arrow, crossbow, shotgun, knife or other weapon capable of inflicting injury to persons, animals or public property.
Its funny, for some of the other "Prohibited acts" list they site the Texas Penal Code, but on this one the site no Texas law reference.
It's good to know I can go to my parks with my family and protect them if need be, despite their attempts to remove my right of self protection.