Hi Jim,
I know I'm coming along a bit late, but I've also recently been on her sister ship the Via Australis from Ushuaia to Punta Arenas, a 5 day cruise back in mid-Jan. So you have an idea, on our cruise, we did the following:
Day 1: embarkation and sail away; anchored off Puerto Williams to view the lights of Ushuaia
Day 2:
AM - visit to Cape Horn and monument (about 2hrs)
PM - choice of hill hike or beach walk at Wulaia Bay to see flora and fauna (about 2hrs)
Day 3:
AM - cruise through Avenue of Glaciers, to Pia Glacier for a short walk (you could go up a muddy hill if you wanted) (about 2 hrs)
Day 4:
AM - Zodiac to Piloto and Nena glaciers - about 1 hr
PM - Aguila Glacier - 2 groups, the beach group or the muddy group. The beach group walked along a rocky beach to the glacier. The muddy group walked right through the island in up to chest high mud to see the same view. Bring your own special wares for this, and prepare to jump into the river to clean off. about 2 hours
Day 5:
AM - we were supposed to have gone to Magdalena Island to see the Magellanic Penguins, but the waves were too harsh, so this excursion for us was cancelled.
Shortly thereafter, we arrived in Punta Arenas and were disembarked.
Note that our safety was always paramount in all their decisions, so it's important to be flexible and understanding.
We thoroughly enjoyed our time on the Via Australis, which made great use of the available space. Meals were pretty good, and the staff was very friendly, personable, knowledgeable, and professional.
Hope this helps in your decisions.
