We are a family of 4 with 2 teenage boys. This will be our first time to the Big Island. We will fly in and out of Hilo, so I am thinking to spend 5 days in Hilo, drive to Kona, stay for another 5 days and drive back to catch the flight. I booked the Dolphin Bay, because we usually spend all day out exploring, and only come back to shower and sleep, and I also like rooms with kitchen, so we can prepare simple meals if needed. For us, VNP is a must, but is it worth of spending 2 days? I also would love to visit the farmer's market on Wed/Sat. Any other must-see in/around Hilo area? Also, what is the best route to drive to Kona? We want to take a more scenic and leisure route to Kona (if there's any), but a direct way back to catch the flight on time (it leaves 9 at night). Any suggestion is appreciated.