Sorry for the late reply---it can get cool in th mountains---casual is good---can get rain & cool---lots of folks were dressy casual----I wore jeans a lot.
Take some jackets.
Blessings

Sherri and I took the River Cloud ll down the Danube a couple of years back. Just astounding as to food, accomodations, and scenery. We could not offer a high enough praise for the way Sea Cloud/River Cloud adventures treats and takes care of its travellers. I also was on the Sea Cloud about 10 years ago for a cruise of the West Indies. Also just an amazing trip. In fact, for a pure high end vacation - and I have been to the Atlantis Resort three times - I have to say that the Sea Cloud and River Cloud trips were head and shoulders above the rest.