We completed our Rhone cruise on River Royale in mid-May and it was fantastic in all categories. Staff, accomodations, food, and itenerary were superb and we had a ball. We are from the Napa area, and while most French wines can't beat our California wines, they were quite nice and the wine for both lunch and dinner were delicious, plentiful and free! as for dress--even for the captain's dinner, dress was quite casual and only 3-4 men had ties, and most women wore nice pants and top. Other dinners were even more casual. Most guys wore dockers or similar and polo or similar shirts.Saw quite a few levis.
This was our first river cruise and can't wait to do it again! I would describe this as a "floating 5 star hotel" experience.