Hello Michelle,
Wow, not much to add to the threads of Anakiwa and Wahine. It's sounds like these ladies have done this before !!! Congratulations on your decision to run a 1/2 marathon for a cause as noble as pancreatic cancer. Your aunt would be very honored and proud! Well, I would add that age is also a factor to add to any training plan. The older you are the more rest your body needs. This is not always factored in to your average training plan. I've found "Running for Women" to be a good all around training book. I am also a runner/cyclist. It's "OK" to favor one sport over the other when you are training for an event. While you focus on your running for this 1/2 marathon, you won't be doing as many miles on your bike and this is "OK." Think of riding as your "cross trainer." You'll be able to pick up your cycling miles again after your event in November. I think Wahine's idea of a long ride the day after your long run is a good one. Think of your long ride as a "recovery ride" and then take your rest day after this. Be sure to do your long ride with low intensity. I have ran 2 full marathons in San Francisco (Nike Women's Marathon in October 2005 and 2006). You need to know that it's VERY HILLY in good ole San Fran!!! I would suggest that you place a great emphasis on hill repeats as they will help you deal with the terrain. Once again, congratulations on your commitment to run a 1/2 and good luck to you!