Make sure to include a visit to Annecy, often referred to as the 'Venice of the Alps,' in your friends' trip to Rhône-Alpes. This charming town is famous for its picturesque canals, medieval architecture, and stunning Lake Annecy. Take a leisurely boat ride on the lake, explore the narrow streets of the old town, and visit the Palais de l'Isle, a 12th-century castle that now houses a local history museum. Enjoy the vibrant atmosphere of the town's markets, where you can find local produce, crafts, and souvenirs. Annecy is a perfect destination for a day trip or a longer stay.