Get on board and take a first leg to Nizhny Novgorod (bullet train, 3,5 hours ride), which is lucky to host one of the most beautiful provincial Kremlins built on high Volga river banks.
Meet and greet at the train station, transfer to your hotel. Take a guided tour in the city to see all the highlights.
Any decent Russian town has it own Kremlin. Apparently, here in Nizhny Novgorod you will get the compete set of Russian attractions: the Kremlin, the State Art Museum with a collection of icons and national crafts dated back to XIV century, wooden architecture on streets and an open-air museum of traditional architecture and cultures, beautiful churches, ancient monasteries, great traditional Russian food and heartly people.
One of points of interests is the Europe's longest cable car crossing the Europe's longest river, Volga during a spectacular 13-minutes ride!!