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Princess charges the tipping $10 per person per day to your shipboard account.
You can cancel this with a visit to the Purser.
Some do cancel the tipping & give their own OR give an additional amount for excellent service.
No need to feel stupid leaving the dining room.
If you had good service tell them so, give a good handshake or hug goodbye.
I was one who always went prepared with the base amounts for tipping all set aside.
I love the autotipping. Never had ANY reason to cancel it. And usually always give something extra.