Head on out to the Annett Nature Center for the Iowa Invaders Halloween Hike Monday October 23rd. You will be guided along the trail to meet different characters. The cost is $5 per person and those under 3 are free. Hikes leave the nature center at ten minute intervals starting at 6:30pm, and ending at 7:30pm. Call 961-6169 to register and registration and prepayment are required.