Yes, there are some discounts, such as those offered Seniors, and you sometimes can get a fifth night or a rental car free, but hotels generally do not suddenly change prices overnight like the airlines. Nevertheless, prices vary greatly.
Luxury comes into play, of course.
You'll pay more if you want to stay at a hotel on Waikiki Beach like the Royal Hawaiian than if you stayed at the Hawaiian Regent, where you need to cross Kalakaua Boulevard to get to that beach. Within those hotels, you'll pay more or less depending on your view of the ocean. The least expensive hotels are those a block or two inland, where you have to walk to the beach to see it. One excellent choice that I'll recommend is the Outrigger Reef on the Beach, the headquarters hotel for the Honolulu Marathon. Those prices are per room, whether one person or two persons sharing.