In August 2017 my wife suffered a fully-detached retina. If you don't know, rehab from surgery requires no change in air pressure for at least 90 days. Well, that meant no flying and our Mediterranean Cruise in September 2017 had to be cancelled. Thankfully we had trip insurance so all non-refundable expenses were reimbursed.
Six weeks later, we were in the doctor's office for another check-up. Since the eye was healing on schedule, we asked, "Can we take a vacation on a ship?" We live in Seattle so the doctor said, "Absolutely, yes"". A quick call to our AAA travel agent and, 9 days later, we left on a 7 day round-trip to Alaska on HA's Oosterdam. We selected this cruise because we'd previously been to Skagway and the Oosterdam's itinerary included Sitka (instead of Skagway) plus Hubbard Glacier (instead of Tracy Arm).
We were so happy with our substitute cruise...while it wasn't Venice and the Adriatic, we had a wonderful time on the Oosterdam, with its emphasis on European Art and Holland America's partnerhsip with America's Test Kitchen. Sitka is a great city to visit...so much Russian and Native Northwest Indian history; we'd love to go back for a few days!
Traveling to Alaska means you do NOT need a verandah, especially in September. An ocean-view cabin is a much better value. We selected an aft cabin on the main deck (4). This proved to be an excellent choice as it's close to the main dining room, the elevators (to get to the top floors), and disembarking for excursions or just wandering around in Sitka, Juneau, and Ketchikan.