On our recent trip on the Explorer, we ate at Portofino and the food and service were just superb. We ordered a bottle of wine with dinner, and when the check came for the wine, I added a very generous tip for the waitstaff as well. We were there for almost 2 1/2 hours and were never rushed. That dinner was certainly one of the highlights of our cruise and I really appreciated the outstanding quality and attention which we received. There's no way that I would have left the restaurant without additional tipping. They certainly deserved it.
By the way, the white chocolate mousse is to die for!