Immigration: Multiple lines. No hassles and as fast as any place I've been.
Customs: Very strict about food & plants. I had several snacks (which I declared). Beef jerky was confiscated, but dried fish & candy was OK. Guy said they don't allow any imported beef, even in cans. (wonder where the McDonalds burgers come from?)
Currency: (Sep 2001)
Airport tax: F$20.00
Water: The government supplied water system is safe to drink. If you are at a remote spot, check to see if they are on the government water system.
Airport Services: As you exit customs on arrival there is a wide variety of services including a bank, visitors information, Air New Zealand, travel agents, car rental agencies, travel agencies (I recommend ROSIE'S). If you are going to catch a departing flight there is a great little restaurant/snack bar in the corner between international check in and the immigration area. Once you are inside the departure area there are 3-4 large stores on two floors and a small satellite of the restaurant in the main terminal area.