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Хорошего пути and наслаждайся своим временем в Москве are quite good actually, it's just the first one doesn't really fit in and the second is something uncommon to say.

Хорошего пути is about...

1. Have a nice trip - Хорошей (or any other adjective that have a sense of good/bad) тебе поездки (or any other noun similar in meaning to поездка).
Few things:
You can use any other adjective...