Oahu: Honolulu International Airport is 20 minutes (40 during rush hour) from Waikiki. Car rental is mostly by van pickup across the street from baggage claim. An inefficient airport taxi system requires you to line up for a taxi wrangler who radios for cars (about $36 to Waikiki). Other options: TheBus ($2.50, one lap-size bag allowed), SpeediShuttle ($15.48), and the Roberts Hawaii Express Shuttle ($16).
Maui: Most visitors arrive at Kahului Airport in Central Maui. For trips to Molokai or Lanai, ferries are available to both islands and have room for your golf clubs and mountain bike. If you prefer to travel to Molokai or Lanai by air, and you're not averse to flying on 4- to 12-seaters, your best bet is a small air taxi.
Big Island: The Big Island's two airports are directly across the island from each other. Kona International Airport on the west side is about a 10-minute drive from Kailua-Kona and 30 to 45 minutes from the Kohala Coast. On the east side, Hilo International Airport, 2 miles from downtown Hilo, is about 40 minutes from Volcanoes National Park.
Kauai: All commercial flights use the Lihue Airport, 2 miles east of the town of the same name. It has just two baggage-claim areas, each with a visitor information center.