I think there is also a requirement for the route to be the one that is most direct i.e. not the one which takes you 50nm off track so you can dip the wings over Auntie Margaret's house. Saying that, it is probably pretty obvious to suggest that even though the most direct route must be taken, things like restricted areas, danger zones and Class A airspace should be avoided!
I could also recommend keeping all logs, flight plans, notams, landing fee invoices, fuel bills and hire documents after the flight - just incase someone questions it. I doubt they would, but who knows....
Enjoy, I certainly did with mine!