A quick and easy roadside cache at Milly's near Machadodorp, on the N4 between Gauteng and the Lowveld.
Milly's is a great spot to stretch your legs, fill up the car, and browse some interesting little shops. It has nice clean toilets, and a restaurant, where you can feed enormous mirror carp from the deck overhanging the lake, which is called Lake Spurwing.
The cache location is in a high muggle area, but you will have a bit of cover to "do the deed" if you position yourself in the right spot. A camera might also help you to not look too suspicious.
The cache is a magnetic nano.