I toured on Kauai, Maui, Big Island, and rode in the Honolulu area. Maui & Kauai were my favorites. My friends and I disliked the Kona coast landscape. Riding up to Hawaii Volcanoes NP from Hilo is easy due to the very gentle grade. Riding up Waimea Canyon on Kauai is hard but worth it. The road to Hana on Maui is nice, but you don't need a mountain bike.