Если строго по асфальту и избегать трасс М4 и А144, то варианта видится два:
[map]52.06914,39.71905 52.07384,39.72197 52.06576,39.72579 52.05801,39.7327 52.05101,39.7403 52.03718,39.73515 52.01616,39.76158 52.00613,39.78785 51.93326,39.78081 51.88115,39.73618 51.85614,39.66339 51.76784,39.60983 51.76572,39.58855 51.75275,39.58855 51.76572,39.52812 51.74064,39.4725 51.75679,39.42307 51.73702,39.35097 51.73064,39.34925 51.73171,39.3187 51.72745,39.31801 51.72745,39.29638 51.70171,39.29089 51.7032,39.27338 51.68597,39.26445 51.69576,39.22359 51.69235,39.2078 51.69491,39.1975 51.71405,39.19132 51.71363,39.18137[/map]
[map]51.65042,38.60838 51.69171,38.60012 51.72171,38.61317 51.74489,38.65643 51.75637,38.67187 51.76848,38.67085 51.79333,38.73299 51.86865,38.73299 51.88815,38.73505 51.89535,38.72921 51.90044,38.73402 51.86674,38.78586 51.882,38.80886 51.90086,38.81641 51.89133,38.84834 51.91569,38.90224 51.9159,38.91186 51.91018,38.91941 51.93792,38.96027 51.93728,38.98258 51.9413,38.98808 51.94363,39.01279 51.9394,39.03751 51.94067,39.06223 51.93157,39.08455 51.92183,39.10137 51.91505,39.10652 51.89811,39.14394 51.89196,39.17759 51.88582,39.17072 51.86801,39.17313 51.85147,39.15424 51.85444,39.14978 51.83875,39.14257 51.80501,39.13811 51.78993,39.14635 51.78483,39.19785 51.73532,39.17965 51.71193,39.17965[/map]
Ну и первый можно начать от Графской, чтобы поменьше
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Ну ещё можно от Колодезной замутить, в принципе, как по правому, так и по левому берегу Дона
