Thinking of booking a flight using points but it arrives at KOA at 8:30 pm. After getting the car and heading out, how daunting a drive would it be to go to VNP or Hilo at that time? This is our first time on BI and we'll be staying 4 or 5 nights at the Sheraton, but thought arriving a couple of days earlier we could go to VNP. This is mid March 2013, so it may still get dark fairly early, I'm thinking. Would you advise to stay the night near the airport and then go in the morning?