Thanks for this, BradYoung04.
We did Karangahake last December and my Labrador had a lot of fun, especially when he could get into the river and have his mandatory dip. There was also a long tunnel with chilly air inside. I don't know whether the air got into his tummy or what, but he had a diarrhoea half way in. (He didn't eat anything unusual that day or day before.) Good thing there was running streams at the sides of the tunnel and we had his cup to wash it away. I wonder if this happen to any other dogs!
We have found some very good dog parks in Auckland. E.g., Botanic garden dog exercise area at Everglades Road, Mt Mangere, Macleans Park, the beaches, etc.