Scalds, shock and even death are potential consequences for people entering geothermal areas such as Sulphur Bay and Waiotapu Mud Pools.
Because of this, signage has been reviewed and is being increased by the Department of Conservation to make visitors aware of these hazards.
"I think people underestimate how hot geothermal areas can be and also the ground around these areas can be unstable ... the crust is thin on top and boiling hot water sits just below the surface," Department of Conservation ranger Colette Wi said.
At Waiotapu mud pool there are defined footprints in the mud showing where people have crossed safety barriers.
Temperatures in this area exceed 100C and noxious gases may be emitted as a result of the geothermal activity.