Stinging tree (known also as the Gympie-gympie) grows on the edges of tracks and clearings where the sun has a chance to reach the forest floor. Its fine poisonous hairs on its heart-shaped leaves  penetrate the skin if brushed (even lightly). The sting can be excruciatingly painful and can cause illness and even may require medical attention. If affected by these plants, try to avoid rubbing the skin (difficult to do as the itch and pain is driving). A way to alleviate some of the pain is to apply a good adhesive tape over the area and tearing it off (much like a body wax) this can - but not always, remove the nettles that are embedded into the skin. If headaches or other signs appear, it is advisable to seek medical advice.

Wait A While (climbing vine)
This is a climbing palm species also known as Lawyer Vine. This plant grows throughout the rainforest region. The main stem of the plant is covered with sharp bristles, and long, whip-like strands grow from the plant and hang down. These 'whips' are covered with small hooks and are often not noticed by site seers until they get snagged on them. The hooks can pierce your skin and tear your clothing. Be watchful of your face and neck.

Information obtained from Queensland Parks and Wildlife Service fact sheets.

Stinging Tree leaf

Some rainforest fruits are edible. But it is advisable not to eat ANY of the fruit unless you actually know what you are eating. Fruits and seeds commonly eaten by birds and animals may be dangerous or even fatal to humans.  It is safer to avoid the fruit altogether even though many look tempting. The animals that feed off these fruits have evolved to digest the toxins that are present in  many of the fruit. It's best to safe than sorry and avoid the temptation.