Eco Trail de Paris

Goodness me! We are off to Paris next weekend to run 80kms in a row in an event called the Eco Trail de Paris. I am ill prepared.
Things you need to do to run 80kms vs Things that I have done
sign up. Tick
buy a ticket to Paris. Tick
Raise some money. Tick http://www.justgiving.com/Daren-Packham (Not enough yet due to lack of confidence)
Train like a maniac.......? Hmm
buy new running shoes. Tick