If you can find a park that has EMH's that morning, take the bus to that park, and then transfer to the AKL bus. If there aren't any parks with EMH that morning, be out at the bus stop by 8am. Take the bus to AK, and then transfer to the AKL bus there. Ask the bus driver if there will be buses going to AKL from AK pretty regularly when you get to AK. The driver may opt to drop you off at AKL either before or after he gets to AK.
There is always a chance of missing a boat or bus..but there will be another one coming along within 20 or less minutes. Plan to leave plenty of time when going from resort to resort.
Your other option is to take a cab..that would be fastest.