Known as the "Venice of America", Fort Lauderdale is a network of 260 miles of navigable waterways that can be toured by water-taxis. The Intracoastal Waterway runs parallel to Route A1A, linking coastal beach communities. The Atlantic shoreline stretches for 23 miles and fishing, boating and reef diving on Greater Fort Lauderdale's artificial reef system are popular pursuits. Downtown, major museums, the Las Olas Riverfront complex with its trendy shops, restaurants and cafes and the Riverwalk that connects the Arts and Science district have benefited from significant investment under a major renovation program. Sawgrass Mills has undergone major expansion to become the world's largest outlet mall. Cultural attractions include the Museum of Art, housing a fine collection of twentieth-century European and American art, the Broward Center for Performing Arts (which is accessed by water-taxi) and the Museum of Discovery and Science, featuring 200 science and technology exhibits and a 3-D IMAX theater. For those who simply wish to enjoy the superb surroundings, there are opportunities to play golf on the numerous courses in the area, stroll along the pedestrian-friendly walkways of the Fort Lauderdale Beach Promenade, or explore the Flamingo Gardens and Arboretum, a 1.5-mile narrated train ride through the hammocks and wetlands.