A good rule is: you’ll usually make the same kinds of photos on a trip that you make at home. If you rarely use the 70-300mm normally, don’t assume travel will suddenly change that.

For a simple, light kit, the 17-70mm is the safest core lens. It covers most travel and landscape needs, and your 8mm fisheye makes sense if you already know you enjoy using it for wide scenic views or panoramas. The 18-55mm is largely redundant if you’re already bringing the 17-70mm.

The main decision is the 70-300mm. If weight matters on hikes, leaving it behind is reasonable. But New Zealand’s scenery can also reward a longer lens for isolating distant details, compressing landscapes, and occasional wildlife or flower shots. If you’d regret missing those opportunities more than you’d mind carrying it, bring it.

Best approach: make a mental or written shot list for the places you’ll visit, then pack for those images. In practice, that likely means 17-70mm + 8mm, and add the 70-300mm only if you specifically want distant landscape details, wildlife, or close-up work.