We (4 couples) are travelling to Hawaii in September for a friends 50th birthday and spending 8 nights in Waikiki. We would also like to spend 4 nights on the Big Island. Our question is should we stay in or near Hilo or Kona? We want to see the Volcano, Thurston Lava Tube, Hilo Waterfall, Jaggar Museum, Black Sand Beach. I am sure there are probably other great places we should see also.