Holy Trinity Cathedral is an Anglican cathedral at 446 Parnell Rd in Parnell, Auckland, and the mother church of the Diocese of Auckland. It has a 4.7 rating from 903 Google reviews. Its website lists Sunday services including an 8am said Eucharist and a 10am choral Eucharist, with the choir singing in term time, and an Evensong on the third Sunday of each month. Reviewers call it beautiful and elegant, praise the organ, and say staff and volunteers gave a friendly overview. One notes there is no entrance fee.
A cathedral makes a good stop for its architecture, stained glass and music, so it helps to plan around services. Visiting outside worship times gives a quiet look around, while attending a choral service or Evensong lets you hear the organ and choir in the space they were built for. Dress modestly, keep voices low and ask before photographing during a service. Guides or volunteers are often happy to explain the building's history if you ask.
For a quiet look at a historic cathedral, or a sung service in Parnell, Holy Trinity is worth a visit.