5 Best Sights in North Kona, Big Island

The trails at this sheltered 1,160-acre coastal park near Honokohau Harbor, just north of Kailua-Kona, are popular with walkers and hikers, and it's a good place to observe Hawaiian archaeological history and intact ruins. These include a heiau (temple), house platforms, ancient fishponds, and numerous petroglyphs along a boardwalk. The park's wetlands provide refuge to waterbirds such as the endemic Hawaiian stilt and coot. Two beaches here are good for swimming, sunbathing, and sea turtle spotting: Aiopio, a few yards north of the harbor, is small and calm, with protected swimming areas (good for kids); Honokohau Beach, also north of the harbor, is a ¾-mile stretch with ruins of ancient fishponds. Of the park's three entrances, the middle one leads to a visitor center with helpful rangers and lots of information. Local docents with backgrounds in geology or other subjects give nature talks. To go directly to the beaches, take the harbor road north of the Gentry retail center, park in the gravel lot, and follow the signs.

It's slow going down a 1.8-mile, bumpy but partially paved road off Highway 19 to this beach park, but the lovely beaches are worth it when you reach the end. Very low-profile rentals may have some trouble making the drive. This state park encompasses three beaches: from south to north, Mahaiula, Makalawena, and Kua Bay, which has its own entrance. Mahaiula and Makalawena are classically beautiful expanses of white sand with dunes. Makalawena has great swimming and bodyboarding. (Note: Makalawena, sandwiched between the two state parks, is private property and falls under the jurisdiction of Kamehameha Schools Bishop Estates.) Watch out for rough surf and strong currents. From Makalawena, a 4½-mile trail leads to Kua Bay. If you're game, work your way on foot to the top of Puu Kuili, a 342-foot-high cinder cone with a fantastic coastline view. But be prepared for the heat and bring water, as none is available. Gates at the highway entrance close promptly at 7, so you must leave the lot by about 6:30. Amenities: toilets. Best for: swimming.

Just south of Kona International Airport, a big building with a large photovoltaic (solar) panel installation resembles a top-secret military station, but it's actually the site of the Natural Energy Lab of Hawaii Authority's (NELHA) Hawaii Ocean Science Technology Park and worth a visit. Tours offered by the nonprofit Keahole Center for Sustainability, which helps administer the park, start with the innovative Gateway building and encompass the center's history, finishing with a visit to some of the park's tenants. Here, scientists, researchers, and entrepreneurs make use of a cold, deep-sea pipeline to develop and market everything from desalinated, mineral-rich drinking water and super-nutritious algae products to energy-efficient air-conditioning systems to environmentally friendly aquaculture techniques. Seahorses, abalone, kampachi (a type of yellowtail), Dungeness crab, and Maine lobsters are raised here, too. There's also a natural history tour that takes visitors along the shoreline to learn about seabirds, tide pool denizens, and other marine inhabitants.

On the northernmost stretch of the park's coastline, this lovely beach fronts an absolutely beautiful bay with crystal-clear, deep aquamarine water. It's peaceful in summer, but the park's paved entrance, amenities, and parking lot make the beach very accessible and, as a result, often crowded. Fine white sand sits in stark contrast to old black lava flows, and there's little shade—bring umbrellas. Rocky shores on either side protect the beach from afternoon winds and offer some fabulous snorkeling spots. Gates open daily from 8 to 7. In winter, surf can get rough, and often the sand washes away. Amenities: parking (no fee); showers; toilets. Best for: surfing; swimming.

This coffee producer offers hourly "bean-to-cup" tours, including a tasting and access to the processing plant, which shows dry milling, sizing, coloring, sorting, and roasting. For $10, take the lava tube/nature walk in the cloud forest ecosystem. There's a small retail store where you can purchase coffee and souvenirs. Remember that afternoon rains are common at this elevation, so bring an umbrella and sturdy shoes.