Another recommendation for a Flight to KI here. From PP return you're looking at about 2-3 hours depending on aircraft type and winds (although you can always draw this out
). Pick a good day and spend some time in the sounds, stop off in Omaka and have a look at the museum, then down the coast to KI (or through the hills to Hanmer first), get your crays (or a coffee at Wings over Whales), then back over the strait to PP. Fantastic day out