Sacramento's 12th annual Free Museum Day, from the Aerospace Museum of California at McClellan Park to the Old Sacramento Schoolhouse Museum was heavily attended. Twenty-six (26) greater Sacramento area museums offered free admission all day long. The event was presented by the Sacramento Association of Museums (SAM), and supported by Umpqua Bank. The Aerospace Museum of California (above and below) features 39 military and civilian aircraft, aerospace exhibits, an Aviation Learning Center, tours, and simulator ride.   The Crocker had long lines throughout the day, as did Old Sacramento's California State Railroad Museum.   A boy tests the old water pump at the Old Sacramento S