Originally Posted by
747FC
It would be helpful to know what lounge access you desire. There are several lounges. So, to partially answer your question, "No, the Hawaiian lounge is not the only airport lounge."
Really? I couldn't find one and the airport's website only lists the Hawaiian Airlines lounge
http://hawaii.gov/ogg/customer-service/airline-lounges I would take any Star Alliance or Priority Pass lounge flying on Air Canada.