Investigators are still looking into the cause of a structure fire in Eureka. The City of Arcata is reminding hunters of some ground rules for the marsh and wildlife sanctuary. More than 20 riders saddled up at the Humboldt County Fairgrounds for an "Arena Play Day". Humboldt Bay Fire hosted Bark in the Park, a 5k run/walk for man and his best friend. Discovery Museum offered a "Free Museum Day" for kids. Plus, student's brought out the chef hats and got culinary and competitive.