Labour Party leader Phil Goff leaves for Samoa and Tonga on Monday to assess the recovery and rehabilitation needs following the Pacific tsunami.
An 8.0 magnitude quake triggered the devastating waves on 29 September, killing at least 184 people in Samoa, American Samoa and Tonga.
Mr Goff says his four-day visit will involve meetings with communities and their leaders.
He says although New Zealanders have been generous in supporting those who have suffered, a big rebuilding job lies ahead.
Mr Goff says he will also be talking about development, trade and threats posed by global warming.
Mr Goff will be accompanied by Labour's Pacific Island spokesperson Luamanuvao Winnie Laban and Foreign Affairs spokesperson Chris Carter.