Hot water can be found along most of the beach. Stand at water level, wriggle your feet and If not careful, burnt feet can result.
At the western end of the beach, hot water is present from depth, not just the stream. Its a matter of finding the interface between hot and cold sections for bathing. Unfortunately the interface can be quite sudden so it can be difficult to find comfort between the too hot and the too cold.
There is no road access, so is typically accessed by boat. The camping area there is administered by Dept of Conservation (I think) and is very popular during summer holidays.