Zealandia is offering admission at the door for $2, normally $18.50 for adults, on September 11. It's their conservation day. There will be a lot of people there so they recommend to take public transport as parking is limited.
ZEALANDIA is the world’s first fully-fenced urban ecosanctuary, with an extraordinary 500-year vision to restore a Wellington valley’s forest and freshwater ecosystems as closely as possible to their pre-human state. The 225 hectare ecosanctuary is a groundbreaking conservation project that has reintroduced 18 species of native wildlife back into the area, 6 of which were previously absent from mainland New Zealand for over 100 years.
Ad is from today's Dominion Post.
Visited a number of years ago, it's pretty cool. Will be crowded on a cheap entry day though, so might pay to arrive early.