Lots of zigs and zags in this one, about 54k [remember divide by 8 and multiply by 5 to get miles] . 594 metres of climbing so it is definately not flat, on the other hand none of the ups are particularly steep, or long.
About Sunday morning rides
A pleasant Sunday morning ride, at a modest pace and in good company every other Sunday. Various start points.
This article describes what you should consider bringing with you.