Auckland-ish recs for sister?

[bironic]

Hey, NZ friends. My sister and her new husband will be honeymooning in Aotearoa/New Zealand for a couple of weeks, starting in about a week. They'll be based in Auckland. They have some basics planned, like the Hobbiton and glow worm cave day trip, but are welcoming recommendations on what else they should see or where to eat. Any personal favorites that are reachable by public transit or tour? Things they like include: nature, animals, nerd stuff, vegan food, whiskey, things that aren't found in the U.S. northeast.

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[bironic]

Update: They sent pictures from Rotorua and it looked marvelous.