I think one of the best ways to get a sense of the Big Island is to read through Trip Reports, but they can be hard to find, so I compiled a list from the last year. They are divided by where the poster spent their nights, not necessarily where they went, so a "Kona" TR may include a daytrip to Volcano, for instance. Also, "Kona" includes all of the Kona district, and so while most are from pople who stayed in Kailua Kona or Keauhou, some include the Four Seasons Hualalai or South Kona stays.
I didn't try to pick and choose, I just posted all I could find in about the last year, so if I missed you, please post a link to your TR here and rest assured, it wasn't personal! :-) This turned out to be pretty time-consuming, although it was fun to read through all the TRs again as well as those I had missed, but it made me realize it is REALLY helpful to include in the title/subject what areas your TR covers.