The shortest possible route to a mountain gorilla family: a pre-dawn departure from Kigali, the 7am trek briefing at Kinigi, a morning in the forest, lunch with a volcano view, and you are back in the capital for dinner. It exists because Rwanda is the only country where this is genuinely doable — the park is under three hours from an international airport on tarmac the whole way.
Be honest with yourself about the pace: you'll be up at 4am and treks can run long if your assigned family has moved overnight. But if you have one spare day in Kigali — between business meetings, or en route elsewhere in East Africa — there is no better way on the continent to spend it.