two weeks isn't going to make a fatal dent if you've been training up until your holiday, so don't despair at all.
my advice would be to ease back into the RW schedule if that was working for you, but do so gradually - and most important of all, which I'm sure you know, don't try to make up for lost time.
the one thing you want to avoid right now is getting injured - so easy does it, especially with speed sessions and long mileage (the rule of thumb is between 5-10% increase in distances per week and no more!) and equally try to factor in a week or two where you "plateau" or even cutback, in addition to your final taper.
I'd also agree with the others about the importance of "time on your feet", because it's those long runs that will give you the most confidence going into the big day, and they're the one ingredient that is really indispensable (especially if you've got any anxieties about "hitting the wall"), as they train you to cope with the messy business of burning fat for fuel once you've run low on stored glycogen.
don't panic - there's still plenty of time, and best of luck. s.