Took a private tour with David's Taxi. Cost was $60 a person (min of 6 people for this price). It was arranged by one of our fellow passengers. We were picked up at the dock and the driver was very knowledgeable of Hilo and all admissions where included in the price. We saw all the highlights of Hilo and we were always ahead of the crowds. He even took photos for us so everyone could be in the pictures. I would recommend his service.
The driver was very good and funny. He started out the tour in Honolulu and then onto Waikiki, then onto Hanauma Bay and Nuuanu Poli lookout. We had plenty of time in each spot for pictures and explanations.
Not worth the money but you have to do a luau when you go to Hawaii.