You will be there for the tail end of the week long wooden boat show. Awesome.
There are some good charts, just search google images for the islands. Be sure to get a chart that has all the bouy locations. That will help you navigate without a GPS that has marine maps. Do you atleast have a normal GPS that could help you if you get turned around between islands?
Special Thanks and Recommendations to;
PAC Racing Springs
Joint Clutch and Gear