Just so you don't feel too intimidated by the 8 to 10 K distance, there will actually be two routes. For those that want to run, the full run will be around 10Km, while for those that prefer a more leisurely time, the shorter distance will be around 5 Km.
After the run, or walk, there will be a barbecue and the chance to relax. The run is from a private house, so perfectly safe to leave belongings when out on the trail, and yes, there will be water available at the "Beer Stops" along the way.
And finally, there is a swimming pool available at the house, so after the exertions, you can have a dip too, but make sure you bring a towel as well as a costume!