This was our 6th cruise, and our 3rd with RCCL. Prior to the trip we read the various cruise reviews for Adventure of the Seas, and was frankly a little nervous about norovirus issues and the locals having a cut rate cruise, etc...
There were a lot of reminders to wash hands on the ship, however the cleansing towelettes were only offered when coming back aboard from port. We had a little bottle of hand sanitizer that we used at the buffet meals. Better safe than sorry. No problems with that issue that we ever heard about.
The passenger composition was what you would expect in mid winter. Lots of Canadians, upper US states and 40 countries. Lots of Spanish, French, German being spoken during the week. A very nice blend.