Here are a few suggestions for your next trip from Gap(F)

In 4 hours, you can reach Marseille, Lyon, Montpellier.

In 5 hours, you can reach Genève.

In 6 hours, you can reach Paris, Turin, Lausanne, Nice.

In 7 hours, you can reach Monaco, Brussels, Milan, Basel, Toulouse, Bern, Anderlecht, Strasbourg, Schaerbeek, Lille...

In 8 hours, you can reach Luxembourg, Zürich, London, Barcelona, Antwerpen, Dudelange, Gent.