FREE. A moai is a group of 5–8 people who walk together for an hour, once a week. To learn how to sponsor a hike or join a Walking Moai, contact Azucena Chavez-Huerta: 707-489-3229. Thursdays: 7:15 a.m. Tuesdays (starting Jan. 10): 4–5 p.m. Hopland Research Center. 4070 University Rd., Hopland.