FREE. For dads of disabled or special needs kids. Leashed dogs allowed. Parking: $7. Meet at gazebo at 11 a.m. for a few-mile hike. Lunch at 12:30 p.m. Sandwiches & drinks provided. Helen Putnam Regional Park. 411 Chileno Valley Rd., Petaluma. tinyurl.com/3puj8vpx.