Been there 4 times.
First time was Oahu, stayed in a big motel across the street from Waikiki beach. Did a bus tour that went around the island, seen the lagoon where Blue Hawaii was filmed, a pineapple plantation and the north shore, did a helicopter tour of the whole island, and did a tour of Pearl Harbor. The Pearl Harbor tour sucked as they were doing updates to the whole thing and the museum was 3\4 empty and they wouldn't take us out to the memorial or the Missouri because they were reconstructing the docks to load people onto boats. Pissed me off big time.
Next 2 trips were to Maui to 2 different resorts on the south side of the island. First time we rented a car and did the Hanna Highway and a trip Lahaina. Second trip we just stayed on the resort.
Each one of these trips the company that took us, flew 300 to 350 people over. And we were there for 7 days each time.
The last trip was to the big island, got off the plane jumped on a bus and went to a resort and the farthest we went from the resort was 3 miles. The company took us took 150 people over and they brought in Montgomery Gentry to do a concert for us.
Sorry, can't help with what it costs to go\be there.