Waipu Golf Club is a golf course at Kaipara Flats in Rodney, with a Google rating of 4.5. Its website describes a local, member-based club that runs tournaments and coaching and relies on community sponsors to maintain the course.
A good golf course is judged first on its greens and fairways, so ask about recent conditions, especially after wet weather. Country clubs like this are often friendly to visitors, but it is worth ringing ahead to check tee times, visitor fees and whether you need to bring your own clubs and a handicap card. Regulars know that mornings are usually the quietest and calmest, and that a club's members are generally happy to point out the tricky holes. Keep to the course etiquette, repair your divots and ball marks, and keep pace with the group ahead.
For golfers around Kaipara Flats and the wider Rodney area, Waipu Golf Club is a well-rated local course to look at.