"The message to the public is clear. For your own safety, stay away from the island.
"By all means, look from the water but please don't go on to the island. It's extremely unsafe. There are some very old, tall pines that could fall at any time."
Both DoC and South Canterbury Rural Fire District are still investigating the cause of the fire, which burned an estimated 80 percent of the island's vegetation.
DoC Partnerships South Canterbury manager Sally Jones said she was greatly impressed by the community's response to the blaze.
"The Tekapo New Zealand Fire Service volunteer brigade were on the island within 40 minutes of the fire breaking out, pumps going, via the local police officer's boat.
"The heroic response to this event clearly demonstrates the value of this special place to iwi, the local community and visitors to the area.
"It's early days for the recovery but the department recognises both the huge cultural significance of this place and the desire from iwi and the public to restore Motuariki, and we will look into the possibilities around this."
Lake Tekapo Volunteer Fire Brigade Chief Fire Officer Craig Willis said while the fire was not the biggest he had attended, the destruction of vegetation was "a pretty big loss" to the community.