I need help with an Inter Island Transfer

Can anyone help me in finding an efficient way to travel between the Blue Lagoon resort and Beqa Lagoon Resort on April 3, 2010? I live in the US and this will be my first trip to Fiji and am having troubles finding a transfer that will take only one day. There will be 2 adults and one child (10 years old) traveling in my party. We will be Arriving in Fiji March, 29 and staying through April, 11, splitting our time between the two resorts mentioned above. If anyone could assist in this matter, or point us in a direction toward someone that can- I would greatly appreciate it. Thank you in advance- Jacquie