Busselton's 1865 timber-piled jetty – the longest in the southern hemisphere (1841m) – reopened in 2011 following a $27-million refurbishment. A little train chugs along to the Underwater Observatory , where tours take place 8m below the surface; bookings are essential. There's also an Interpretive Centre, an attractive building in the style of 1930s bathing sheds, about 50m along the jetty.
