yep, there is no lodging near the airport. taxis are available as long as you don't get in at one in the morning or something. but hawai`i is a friendly place, so in wierd circumstances don't hesitate to ask someone to give you a lift.
your message implies that you will arrive with no hotel reservation. that may not be wise. also, without a car, how will you get to the volcano and other beautiful places?
while you're on daylight savings time, there is a six hour difference hst to edt. hst to est is five hours.
have a great vacation!