the back way from murray bridge to littlehampton is a good drive rather than the freeway- through Monarto, Callington and Kanmantoo and Nairne (where I live)
on the return trip would also go through bridgewater and aldgate, through germantown hill and def go through Hahndorf.
https://www.google.com.au/maps/dir/United+Petroleum+-+Murray+Bridge/The+Crafers+Hotel/Ashton+SA+5137/Magill+SA+5072/-34.8370779,138.8216024/Birdwood/Lobethal+Bierhaus/Lenswood+SA+5240/Balhannah,+South+Australia/United+Petroleum+-+Murray+Bridge/@-35.0137034,138.7427663,13z/data=!4m87!4m86!1m25!1m1!1s0x6ab70cdd2e2da227:0x2cafa0e990cd54ef!2m2!1d139.2532241!2d-35.1280473!3m4!1m2!1d139.0373207!2d-35.1264307!3s0x6ab73d87adc09bcb:0xdbd2ce81be492a50!3m4!1m2!1d138.8076892!2d-35.0261543!3s0x6ab73165c2b8f0bb:0xa262084534f6746b!3m4!1m2!1d138.7806858!2d-35.0165576!3s0x6ab733c725b0bb43:0xb649e65b3a13a732!3m4!1m2!1d138.7302066!2d-35.0104567!3s0x6ab732d9c9e4b3a7:0xf4ae2e3413737d0b!1m5!1m1!1s0x0:0xd7fb980b2b25c4e9!2m2!1d138.704613!2d-34.997917!1m5!1m1!1s0x6ab7351f4bf835ef:0x5033654628ea8d0!2m2!1d138.737222!2d-34.939722!1m10!1m1!1s0x6ab0ca543b59c41f:0x5033654628eb7c0!2m2!1d138.6758!2d-34.909!3m4!1m2!1d138.7301231!2d-34.8920461!3s0x6ab74aa589699733:0xe7df6faf2d8deb18!1m0!1m5!1m1!1s0x6ab75cf54f0d78e1:0x5033654628ea9b0!2m2!1d138.966667!2d-34.816667!1m5!1m1!1s0x0:0x88e501d0e9edd78!2m2!1d138.8732!2d-34.907371!1m5!1m1!1s0x6ab73459326d9b6f:0x5033654628eb6b0!2m2!1d138.8315666!2d-34.9172455!1m10!1m1!1s0x6ab736f2614c0015:0x5033654628ea910!2m2!1d138.827385!2d-34.9893754!3m4!1m2!1d138.9304704!2d-35.041635!3s0x6ab73971b4388d39:0x305458d0c2aa2f7e!1m5!1m1!1s0x6ab70cdd2e2da227:0x2cafa0e990cd54ef!2m2!1d139.2532241!2d-35.1280473!3e0