What's a good 3-day itinerary for Big Island?

Big Island is not a walking destination. It covers 4,028 square miles, and the two main towns, Kailua-Kona on the west coast and Hilo on the east, sit 95 miles apart. The only public transit is a county bus that takes over 3 hours coast to coast. Reserve a rental car before your flight. This itinerary starts on the dry leeward Kona side and works east, so you sleep near Kailua-Kona for the first two nights and either overnight in Hilo or loop back on Day 3. Sea-level temperatures in August hold around 28°C with humidity that clings to your skin, but Saddle Road between Mauna Kea and Mauna Loa climbs above 2,000 metres where readings drop below 11°C. Pack a fleece. Reef-safe sunscreen is required by Hawai'i state law, and the black lava along the Kohala Coast radiates stored heat well past sunset.

Day 1 stays on the Kona Coast, a 40-kilometre strip of dry lava shoreline. Start at Kahalu'u Beach Park by 8am. The reef sits in waist-deep water, and green sea turtles graze on limu algae close enough to touch. Parking fills by 9:30, so arrive early. Drive south to Pu'uhonua o Hōnaunau National Historical Park ($20 per vehicle) by late morning. The reconstructed ki'i guardian carvings stand facing the ocean, and the grounds carry a stillness that photographs won't prepare you for. The tide pools along the park's southern edge hold small fish and sea urchins if you look carefully. On the way back north, stop at Greenwell Farms in Kealakekua for a free Kona coffee tasting. The roasting room smells like dark chocolate and wet earth. Dinner at Da Poke Shack on Ali'i Drive in Kailua-Kona before 6pm. They close when the fish is gone. The ahi poke is cold, briny, dressed with sesame oil. $15-18 per bowl.

Day 2 heads north into Kohala. Pu'ukoholā Heiau National Historic Site overlooks Kawaihae harbor, a lava-rock temple Kamehameha I built between 1790 and 1791 to fulfill a prophecy of island unification. The dark stone walls rise about 7 metres and radiate stored heat even at 9am. Continue on Highway 270 through dry ranchland to Hāwī, a former sugar-plantation town with one main street. Lunch at Sushi Rock runs $20-25 a plate. Get the hamachi collar. From Hāwī the road dead-ends at Pololū Valley lookout. A steep 20-minute trail drops to a black-sand beach lined with ironwood trees. The footing gets slippery after rain, and the climb back up feels longer than it should. Afternoon at Hāpuna Beach State Recreation Area ($5 parking), where about 400 metres of pale-gold sand faces gentle summer surf. Water temperature in August tends to sit around 27°C.

Day 3 crosses the island to Hawai'i Volcanoes National Park, a 2.5-hour drive from Kona via Saddle Road (Highway 200). You'll feel the temperature fall through the open windows as dry grassland gives way to ōhi'a cloud forest. Enter the park ($30 per vehicle, valid 7 days) and walk to the Kīlauea caldera overlook first. Even when the volcano is quiet, the sulfur vents along the Sulphur Banks trail hiss and smell like struck matches. Walk through the Thurston Lava Tube (Nāhuku), a 150-metre tunnel of cooled basalt with ferns dripping at the entrance. The air inside is cool and damp, maybe 18°C, a relief after the tropical heat at the trailhead. Then continue 30 miles northeast to Hilo. Stop at Rainbow Falls (Waiānuenue), a 24-metre waterfall 2 minutes from downtown. The mist from the falls carries across the overlook on trade-wind days. End at Café 100 on Kilauea Avenue. Order the loco moco. A hamburger patty over rice, brown gravy, fried egg on top. $6-8 for the original.