Kaiser Hospital in Moanalua would be the best choice for you, since you already have nursing experience in acute care, under your belt. Lucky you. Pretty soon going to be a new-grad, and it's difficult for new grads to even find work at Kaiser (at least for the hospital here in Hawaii).
Another benefit to working at Kaiser is parking. As you've mentioned, you pay $6.00 to park at the Blaisdell Center if you work either at Straub or QMC. QMC also has a long, long, long waiting list for parking spots for employees. QMC has a shuttle bus that picks up their employees from the parking structure. But for Kaiser, there are plenty of street parking near the Moanalua Golf Course and street parking by The Plaza care home.
Good luck with your decision.