Sunday would be the best time for the ride as nothing is free in the centre on Saturday. There are two large Tesco stores in Perth, but unlike the previous two rides, neither are close to the train station or the intended cycle route.
The best free parking for a Sunday ride would be the car park at the South Inch. If you look at the route map and head directly East from the train station following the proposed route, where it turns 90 degrees and heads up Tay Street this is a roundabout. If you turn left (south) at this roundabout on to Shore road the entrance to the car park is about 100 yards on the left.
This way the folks that are coming by train can easily meet up with the folks arriving by car and we can start the route from here.