Lying out in the middle of the San Franciscan Bay is a tiny man-made structure known as Treasure Island. Once made for the 1939 Golden Gate International Exposition, the island is now a California Historical Landmark and burgeoning trendy neighborhood. Development efforts in recent months have spurred local interest, and nowadays you’ll find this one-time naval training ground to be host of a variety of events and markets. A small stop, it’s still a great place to and picnic or take some photographs of the bay. Be sure not to miss the monthly Treasure Island Flea Market, or the annual Treasure Island Music Festival, held every October.