Earth Day Herb Hike to Matilija Campground Sunday, April 23: 9 a.m. to 3 p.m. See Matilija Creek flowing, learn about local ecology, sample wild black walnuts Cost: $25 adults, $20 seniors 62-up, $15 students 13-18. Kids 5-12 free, one per adult, by arrangement. Register at www.HerbWalks.com or call 805-646-6281