Yes , you can add extra on the last day. On one cruise we gave the waiter
an extra tip . The next week we had the same waiter and the service
deteriorated badly .
We did a B2B cruise and requested the same waiter for the next week.
That was a big mistake.
SS Ithaca , Volendam , Mariner of the Seas (x2) , Veendam , Coral Princess , Island Princess (x3) , Emerald Princess,Sapphire Sapphire (x3),Diamond Princess