3 Best Sights in Hawaii Kai, Oahu

Picture this as the world's biggest open-air aquarium: you come to see fish, and fish you'll see. Due to their exposure to thousands of visitors every week, these fish are more like family pets than the skittish marine life you might expect. An old volcanic crater has created a haven from the waves where the coral has thrived. Note that there's a fee for nonresidents to enter the preserve; make reservations and prepay online ahead of time (locals have a morning time period where they can walk in without a reservation). You must also watch a nine-minute video about the nature preserve in its educational center before being allowed down to the bay. Snorkel equipment and lockers are available for rent, and you can walk the short distance from the parking lot or take a tram. It's best to visit early in the morning (around 7), as it's difficult to park later in the day. Need transportation? Take TheBus each way from anywhere on the island. Amenities: food and drink; lifeguards; parking (fee); showers; toilets. Best for: snorkeling; swimming.

Very popular with locals, this broad, sloping beach is covered with sunbathers who come to soak up the rays and watch "The Show"—a shore break that's like no other in the Islands. Monster ocean swells rolling into the beach combined with the sudden rise in the ocean floor cause waves to jack up and crash magnificently. Expert surfers and bodyboarders young and old brave the dangers to enjoy some of the biggest barrels around.  Use extreme caution when swimming here. The stretch is nicknamed Break-Neck Beach for a reason: many neck and back injuries are sustained here each year. Amenities: lifeguards; parking (no fee); showers; toilets. Best for: walking.

Below a scenic turnout along the Koko Head shoreline, this oft-photographed lava tube sucks the ocean in and spits it out. Don't get too close, as conditions can get dangerous. Look to your right to see the tiny beach below that was used to film the wave-washed love scene in From Here to Eternity. In winter, this is a good spot to watch whales at play. Offshore, the island of Molokai calls like a distant siren, and, every once in a while, Lanai is visible in blue silhouette. Take your valuables with you, and lock your car, because this popular scenic location is a hot spot for petty thieves.