Not run this one before RunnyBunny, but I have run the Pulse Race 5 miler in Roundhay Park that is run some time in June (I think!). Assuming it is the same route, it is run half in the park and half down the streets that border it (Princes Avenue, Park Avenue). That means it is all on tarmaced surfaces - it doesn't go by the lakes (presumably for fear of tired runners accidentally going for a swim). If you know Roundhay Park you'll know there is a sharpish hill heading up to The Mansion, and that is run twice. Overall though it is downhill as you start above the finish line, up above the cricket pitch.
Organisation-wise I obviously can't comment haveing not run this particular race before.
As I say this is all information for the race in June but I doubt it will be much different for this one - there are after all only so many paths in the park!
May well be running this as I live only a mile away, so may see you there.