The long distance forum is brand new, so there may not be many people reading it yet.
You should spend the last week recovering. Rides of about an hour or so, low gears, and slow. You can add a few short (1 minute-ish) high-intensity efforts if you think you will need that for the ride, but you don't want to stress your system at all.
The week before can have some hard efforts, but I'd avoid too much stress.
There isn't much you can do to improve your endurance fitness in the last two weeks before a long ride, but there are lots of things you can do that will make you tired the day of the ride.