The first trail is Pistachio and the last one is a little bit of trail that drops down from Currie to Riccarton Mains Road. The dirt track part of it runs parallel to the golf course before joing tarmac and crossing the railway line.
I'd nominate the top of Harbour Hill as the "where" for breakfast – not sure on the when though.
It might be useful for that. When the dirt track ends it joins with a tarmac route (pretty much traffic free I think) which can be followed into Wester Hailes. I turn the other way at the point they join though as my office is in the research park at Heriot Watt.