You might consider your drone to be a fun toy, but did you know it's an aircraft? There are rules you need to follow while flying to keep yourself, others, and your aircraft safe.
They are part of the New Zealand Civil Aviation Rules. Complying with them can also help you avoid fines or prosecution.
Part 101 describes the rules for non-certificated unmanned aircraft operators - the vast majority of drone pilots.
Certificated operators operate under part 102, which may give them additional permissions beyond what is allowable under part 101.