I did this last year, its part off road and part on the pathways around kingsbury water park, My garmin did make it short I think i made it 5.99miles which is just under 10k it has a couple of hill in it which if muddy u may well slip and slide, it advertised a medal and it was a trophy ( which actually my daughter dropped and broke
) not sure if it will be a trohy or a medal this year
if it is bad weather expect to get wet and muddy, it was easy to get to and parking was fine as its qute abig area and no problems with traffic as its all paths and walkways ( from what i remember it )
but it is 2 laps ( i either hate or love laps lol )