newton shopping centre ? is that on portrush rd ? i guess maybe a little bit further north ? maybe everyone give thier location a draw a circle around the edge of those furthest away on a map and find a location that suits near the middle of that and use it as a regular place?
judging by the google map salisbury is almost the same distance from the city as reynella/morphett vale and magil area is probably the furthest away from the beach trying to match the same distance for both north/south. scout it out around magill ?
also closer start point for hills. old norton summit rd/norton summit rd, then loberthal rd right to collins rd turn right onto green hill rd and left onto mt lofty summit rd a simple but twisty loop from magil out to the hills and loop back to adelaide after stopping at mt lofty.
if most cruise turnouts are like 15 cars max I'm sure even the local deli would have enough parking space