Here are a few suggestions for your next trip from Rheinfelden(Baden)

In 2 hours, you can reach Basel, Zürich, Bern, Luzern.

In 3 hours, you can reach Frankfurt am Main, Winterthur, Stuttgart, Strasbourg, Sankt Gallen, Biel/Bienne, Thun.

In 4 hours, you can reach Luxembourg, Schaan, Paris, Vaduz, Genève, Triesen, Lausanne, Eschen, Mauren, Ruggell...

In 5 hours, you can reach Esch-sur-Alzette, Dudelange.