Thanks for your response Fouremeco. I don’t drive so I booked an excursion through Viator https://www.viator.com/tours/Big-Island-of-Hawaii/Hilo-Shore-Excursion-Exclusive-Volcanoes-National-Park-and-Rainbow-Falls/d669-22796P3
We are doing 2 days in Hilo because our itinerary changed due to the fire in Lahaina. Originally we were 2 days in Oahu. Since they removed Lahaina we now have one day in Oahu leaving at midnight then cruising Napoli coast then 2 days in Hilo and a short time in Kailua before heading to Vancouver. Really looking forward to seeing everything!