I have a Du this Sunday too. I'm not really following any kind of training plan, just doing it for fun since I do both running and biking. So, take what I say with a grain of salt. I usually like to take a rest day the day before a race and take it easy for a day or two before that. I've got a soccer game this Sat so I'm making a few adjustments to my normal pre-race plan. I'm going to ride easy tonight, rest tomorrow and then play soccer on Sat.
Good luck in your race, let us know how it goes!