It's still worth a visit though. They do an interesting tour explaining the mission history, family history and their part in early Tauranga. The house reminded me a little of the Treaty House at Waitangi, both constructed around 1834. Check out their website for some more background.
We spread out on the front lawn in the shade and sketched, enjoying the break from the sun. The garden has some impressive old specimens of both native and introduced trees. On the right of the sketch you can see an enormous Queensland Bunya Bunya tree. Looking like a super spikey Norfolk Pine (or a Chilean Monkey Puzzle tree)with enormous spikey pine cones — you wouldn't want to stand under it.