Yes, I know Hawaii isn't Europe, but it was our first "baby step" of travel since the pandemic started. Here's a summary of our Maui experiences:
We are two fully-vaccinated seniors .
The downloading of the negative [approved] covid test results worked smoothly, and the airlines and hotels required you to produce the on-line result. No one wanted to look at the printed results. There were some problems in areas of poor wi-fi.
It was an advantage to fly an airline that checked your covid test results before you departed, and gave you a wristband. If this did not happen, you were required to stand in line at Maui airport and have your results checked, which took about 20-30 minutes.
The Alaskan Airplanes were almost full- attendants said about thirty seats were open on each flight. Folks were sitting in the middle seats.
The hotels seemed very busy and staff reported that travel has increased greatly in the past few weeks. It does seem that the increase in travelers caught the island off-guard somewhat, as staffing in some places was not enough to meet demand. At the rental car counter, there was only one staff to serve a long line of people, and the requirement to open the Hawaiian visitor app slowed down the process, as the wi-fi was inadequate. We were able to reserve a car in advance, and the cost wasn't horrible [$440 for the week.]
One hotel required a wristband be worn on its property, and the color changed daily, to demonstrate that the hotel was only allowing covid-screened guests on its property. The other hotel did not.
Masks were required everywhere, and compliance good.
Pools were open, but jacuzzis were iffy: one hotel only allowed two people in at a time, with reservations.
Restaurants closed early- around 8pm, so there were lines to get in around 7:00pm
In Lahaina, many businesses were permanently closed; the open restaurants has limited capacity, and thus lines.
Overall, it was a great experience, we felt we were on a vacation, and helped support IMHO that travel can return in the near future.
Good luck and safe travels!.