This park features a diatreme (a volcanic pipe or vent) thought to have been created by a massive gas explosion. The gaping hole is 70 metres wide with steep granite sides that plunge 58 metres to the lake below. The lake itself is 82 metres deep! The park protects unique high-altitude rainforest and is part of the Wet Tropics World Heritage Area.
Have a picnic in the rainforest clearing then walk 400 metres to the viewing deck over the diatreme. Return along the 1.2 kilometre Dinner Falls track. Look for golden bowerbirds, spotted catbirds and riflebirds. Set out with spotlights at night to look for green, lemuroid and Herbert River ringtail possums, and long-nosed bandicoots.