How much does it cost to rent a bike in Hawaii?

I'm curious to know, what's the average cost of renting a bike in Hawaii? Is it a fixed rate or does it vary depending on the rental company, location, or duration of the rental? Are there any hidden fees or extra charges that I should be aware of? I'm planning a trip to the island and want to make sure I budget accordingly for this activity. Can you provide some insight into the typical pricing structure for bike rentals in Hawaii?