Location: South Kau

Known as Green Sand Beach or even Pu'u o Mahana, Papakolea Beach, is well deserving of its name. The olive-like color of the sand comes from the presence of a greenish, semi-precious stone named, appropriately enough, olivine. The erosive force of the ocean washing into the base of Pu'u o Mahana cinder cone has extracted olivines out of the cinder. These are deposited on the sand, giving the sand a green tint. ... Green Sand Beach - Papakolea details continued

Location: Kohala

If you take the time to drive all the way to Pololu Valley at the end of Highway 270, don't settle for the view from the overlook! Take the time to explore.

The trail, sometimes referred to as Awini Trail, that leads down to the black sand beach takes approximately half an hour to hike. The dirt and root trail can be steep in places, but the various views of the valley along the way make even part of the walk worth it. You will find the trailhead near the parking lot. Look mauka and you should see a brown sign guiding you to the trail. It is smooth sailing going down, but getting back up can be a real workout.
... Pololu Valley Awini Trail details continued

Location: North Hamakua Coast

The Muliwai Trail to Waimanu Valley is a strenuous 9-mile switchback trail that climbs 1,200 ft to the top of a ridge, then descends into the Waimanu Valley. The views into Waipio Valley as you start up the trail (often called Z-Trail) are incredible. View our Muliwai to Waimanu Valley trail map.

Z-Trail
Now, if you thought the view from the Waipio Valley lookout was fantastic. We recommend hiking across Waipio Beach to the other side and up the valley wall for a peek into the heart of Waipio. You can see the trail from the lookout. It is the zigzag cut into the side of the cliff. When hiking across the beach you will have to wade through Waipio River which dumps into the ocean. Only try this when the tide is low and always try to gauge the speed and depth of the water before crossing. If you are wearing hiking boots, bring water shoes for this part of the journey. Your feet will thank you later. Once you are at the end of the beach a small path leads to a gate. Do not go through the gate, instead look to your right for several signs that mark the trail head. The walk to the third (and best) switchback is only about half an hour. The trail begins in a very wooded and mosquito ridden area but eventually opens up on the side of the cliff. Once you reach the third switchback, turn around and take in the vast natural sight before you. From this side of the valley you can see deep into the heart of Waipio. If you look closely you should be able to see the lookout and parking lot. From this vantage point you can see the cascading Hi’ilawe Falls flowing through a crease in the valley wall. Notice how far back the valley reaches as it cuts around gently sloping cliff sides.
... Muliwai Trail to Waimanu Valley details continued

Location: Volcano

As you stand at the Kilauea Iki overlook you can see a lightly-etched trail stretching across the crater floor. From your 400 ft high vantage point you might be able to see little specks walking the path: those are people. Kilauea Iki is an approximately four-mile loop that takes 2-3 hours. It skirts the rim of the crater, dips down and across the floor and back up to the overlook. You can either take the Crater Rim Trail to the right around the rim of Kilauea Iki and then down to the crater floor then back up the other side or go left and begin the hike with the descent into the crater. We prefer the first option simply because you can enjoy the beauty of the rim rain forest at the beginning of the hike and the ascent is slightly less arduous. ... Kilauea Iki Trail details continued

Location: Kohala

Waikoloa Beach Resort is a multi-million dollar oasis built in the middle of centuries of lava flows off Highway 19 north of Kona. The entrance to the resort is located between mile markers 77 and 76 heading north on Highway 19. It is home to the King Shops at Waikoloa, an upscale, open air shopping complex which offers a variety of ways for visitors to part with their money. Via the parking lot at the King Shops is access to the Malama Petroglyph Trail. ... Malama Petroglyph Trail details continued