The art gallery is well worth a visit, especially if you are staying in the city as it is right there in the centre (and free to visit!). It's in a beautiful heritage building, with plenty of exhibitions to keep you busy for a few hours. Ensure you check the website before you visit as they often have visiting exhibitions on that are worth a look and see.
There is a nice little café inside too and some fun interactive parts for children to enjoy as well, so a visit here makes a great rainy-day option. If you step outside after and head up behind the gallery, you will find Albert Park.
It's a lovely spot to sit and take a rest on a nice day, and it is so well cared for with beautiful flower beds and a pretty fountain to sit by, with a hot drink or some lunch from one of the many nearby cafés. It is a popular spot for the university students from across the road to chill and relax in too.
Auckland Art Gallery.