Composite decking boards (plastic lumber) are low-maintenance, available in a variety of colours and styles, and are appropriate for any environment, including typically-corrosive salty, ocean side facilities. They should last a very long time.
Wooden benches in front of Canadian War Museum, Ottawa, ON, Canada, is prematurely decaying due to design flaw.
Wooden benches at Westboro Beach, Ottawa, ON, Canada, is prematurely decaying after grand re-opening only 1 year ago.