I've run three NYC Marathons, ('95, '96, '97).
I never ran more than 4 miles per day, except for my long run each weekend. I would cross-train to get in additional cardio. I found that heavy blading on hills made running up hills a breeze and didn't add an excess stress to the legs. Listen to your body and do what works for you. Their are all sorts of different ways to train.
Some race day hints:
-Bring vaseline.
-Factor in the weather!!! (NYC is typically cool or cold on race day, but last year many people dropped out b/c it was unseasonable warm.)
i.e. if it is very hot/humid and you run without any adjustments you may not finish.
-Bring a magic marker to write on your
shirt, so people know who you are...
-Cheer for all the physically challenged runners and feel the elation.
-Tap into the collective spirit of the day, during the race.
-Good luck
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