As of June 1 this year, passengers on Royal Caribbean ships sailing on and after July 1 will have to pay up to $1.70 more, per day, per person, for crew gratuities. The new rate will be $12.95 for standard cabin guests (up from $12) and $15.95 for suite passengers (up from $14.25).

Vacationers with existing bookings will be able to pre-pay gratuities before June 1, in order to lock in the current rate. All gratuities pre-paid after this date will be charged at the new amount.

Celebrity Cruises, owned by the same parent company as RCI, will also raise its recommended gratuities. The new rates will be $12.95 per day, per person, for passengers in a standard cabin (up from $12), $13.45 for Concierge and Aqua Class guests (up from $12.50), and $16.45 for suite travelers (up from $15.50). Passengers who have prepaid tips by May 31 or have prepaid gratuities on their reservation because of a promotion won't be charged the new rate.

Other major cruise lines have already increased their gratuities. Norwegian Cruise Line made the change in February for guests staying in standard cabins, raising the rate to $12.95. Suite passengers pay $14.95 per day, per person.