Why go to Stewart Island? It's a remote, unspoilt, pristine, untouched national park that is 'off the beaten track' to say the very least. With a population of circa 400 and a modest number of visitors it never at any point felt crowded. Stewart, and the other nearby islands, have remained largely pest/predator free and hence the bird life in particular is magnificent in this perfect corner of paradise.
You can rent an e-bike here but we preferred hiking on many of the trails in and around Oban. We did a successful Kiwi spotting trip (which takes place during darkness) and the Ulva Island tour. Both were led by Stewart Island Expereince who have excellent guides.
We stayed at the Stewart Island Lodge which we'd highly recommend. The South Sea Hotel in Oban is a super spot for a relaxed dinner and it has a cracking bar - a perfect place to mix with the locals. Kai Kart must be one of, if not, the most southerly fish and chip shop in the world - awesome fish and chips!
There's no argument - it's a long way to get there but, in these times of heightened environmental and climate concerns Stewart Island perfectly illustrates how well careful long term conservation can ensure us humans and the natural world can co-habit harmoniously.