Toss up between saying BVI a year after Irma, it was so quiet and empty. We spent the day on the beach at Bitter End (its absolutely amazing now its reopened) and if you know that beach its never empty except we had it to ourselves. Went to a bar in Little Bay and just spent the day hanging out with the owner, only ones there, told to help ourselves to beer from the fridge and had dinner with them. BVI is never that quiet during main season, its usually busy to packed.
Other one is Antigua during COVID, quiet beyond belief. Restaurants only allowed to do take out, so they would bring you the meals to your boat. Had a BBQ of the best steak and lobster on the main beach at Barbuda cooked just for us. Last night they opened up restaurants for dine in, only customers at this fancy Mexican fusion restaurant on the beach. They were so happy to have people back, ended up sharing the head chefs bottle of (very expensive) wine as we chatted at the end of the meal.
Most of my favorite holiday stories are when we have gone somewhere and its empty of tourists and just pretty quiet overall.