Ideas: This is an ideas page to help you consider various options. Some of these items are not practical, but they might spark inspiration in a certain direction.
Earth-tone colours for composite decking:
The very back of the lot next to the chain-link fence could be a rock garden that could handle flooding. The perennials here are shade and wet-soil tolerant, but I'd have to confirm if they can grow in this zone. The willow is very moisture tolerant, but it will need sun.