A group of us stayed while attending a conference at Waitangi. Really impressive place - excellent views out over the water, and great options if you want to go for a run or bike ride (the Opua to Paihia track nearby, and the cycle track that you can access from just below the lawn). Lots of sleeping options, and a massive deck with an outdoor fire - we had 7 adults staying, and it never felt as though we were on top of each other or cramped.