River, sneaker hikes -- Sierra Club, Howard County Group, will sponsor a seven-mile hike along the Patapsco River, past McKeldin Falls and Liberty Dam, departing at 9:30 a.m. Sunday. The group will meet at the Bagel Bin in Enchanted Forest Shopping Center off U.S. 40. Participants should bring lunch and water. Ken Clark, 301-725-3306 or email@example.com. The club will offer an easy seven-mile "sneaker hike" on paved trails in Columbia at 9 a.m. Saturday. The group, which will meet at the trailhead parking lot across from 9175 Guilford Road, will return before lunch. The hike offers a chance to see wintering waterfowl on Lake Elkhorn. Sue Muller, 301-498-8462.