Since I began cruising with Regent (Paul Gauguin in 1998; we are Titanium now) I have commented on every cruise review that Destination Services needs to provide an evaluation form. I have gone so far as to make my own which I complete and drop off in the large box for unused Shore Excursion tickets. I doubt my evaluations make it to "headquarters". One Destination Services manager called me and thanked me for leaving the evaluations. The other managers most likely toss them in the trash. It is unfortunate Destination Services doesn't encourage passenger shore excursion reviews since they don't have (or won't provide) staff to do on-site evaluations.
Miso glazed sea bass is available any night by request, at least 24 hours in advance. The fish needs to marinate. Check with your butler, waiter or the Compass Rose Maître d'.
We were in Sendai in April 2019. The shuttle from the Port was to Mitsui Outlet Park. Time was 10-20 minutes each way. There disclaimer was that traffic conditions could impact the time. Nothing about no using in place of local transportation. We were docked at Takamatsu Pier 2.
Apr 29 2019 Passages.pdf
My experience with the Muster Drill is that it was excellent for meeting other passengers. 😀I hope Regent continues with in-person drills and with other events that create opportunities to meet other passengers.
I suggest you call Regent and make the changes. You will need the booking number for your daughter and son-in-law. Personally, I've not had success adjusting a reservation online.