Ka'u is a the largest district on the Big Island of Hawaii between Puna and Kona, consisting mostly of lava fields, grasslands and agricultural exports including Ka'u Coffee, macadamia nuts, and oranges. Volcanoes National Park lies both in the districts of Ka'u and Puna. South Point and Punalu'u Black Sand Beach are notable areas to travelers, as well as Kula Kai Caverns in Ocean View and the Punalu'u Bakeshop in Na'alehu.
Highway 11 is the only available highway to take you all the way through Ka'u from South Kona to Hilo.
The Ocean View Swap Meet is a sight to see every Saturday morning! It's small, but friendly and free.
Punalu'u Black Sand Beach. Off Highway 19 about 45 miles south of Hilo. Beautiful mix of black sand and rocks. A good beach for sunbathing and scenery, but strong rip currents make it dangerous to swim too far from shore.
South Point (Ka Lae). The southernmost point in the USA. To get there, turn makai on the access road about 6 miles west of Na'alehu and head south 10.5 miles (the last 4-5 miles of this road are in poor condition so be cautious). There is cliff-diving just west of the parking area, and a green sand beach is another 2.5 miles east (walk or 4WD only).
Interesting and cheap stuff at the Ocean View Swap Meet on Saturday Mornings.