One of the lesser known government websites that I have come across is https://data.govt.nz/
This is a site that gathers together most, if not all, the data sets offered by all the various government department. From CEO salaries, to land mapping, to health data.
In the past I've used it to find such interesting tidbits as how the median age of death has moved over time and how state sector CEO salaries have moved in comparison to front line workers.
So go browse and find interesting things and make use of the data created via your taxes.