Walk from Lennox Gardens around the south side of West Basin, probably to the bridge over Waringa Inlet (just before Government House) and turn around, stopping off for a coffee at the Yarralumla Brasserie (cafe near the nurseries) on the way back if the weather is nice. Maybe a 9km return trip at a guess. (I'm hoping to do all West Basin one day but will start with this).
Meet at the car park for Lennox Gardens opposite Kaye Street. I'll be standing by a dark blue ford falcon station wagon until we gather a group.