Who knew that one of the five islands in San Francisco Bay was privately owned? Even stranger, "Red Rock Island" is now up for sale, for a paltry $10 million. The last time we remember one of our islands changing hands was way back in 1847, when Captain John C Fremont bought Alcatraz for $5000. Fremont was in town, as you no doubt remember, as the head of a surveying expedition. A man of......