Though Palmerston North Hospital might be what brings you to town, perhaps you'll have a chance to explore more of Palmerston North while you are here.
Take a campus tour or just explore the area of Central Hawkes Bay College, during your trip to Waipukurau. Take in the museums while you're in the area.
You can spend an afternoon studying the exhibits at New Zealand Rugby Museum in Palmerston North. While in this walkable area, find time to visit its spas.