I'm doing the Tour de Cure "Ship to Shore" century ride also. Picked up my packet and jersey last night.
Today, I'm going to play with Garmin routes, and if I can figure it out, will put the Tour de Cure route into my 500 so I won't get lost this time. I seem to miss one or two turns every century ride I do. I'm sort of glad that all the hills are early in the ride. Will make doing the century fairly easy.