Silversea Cruises designated 31 cruises as part of its 2015 Silver Wave program, which provides a suite upgrade and up to $1,000 in onboard credits as a booking incentive.

The offer, which expires Dec. 31, applies to both Silversea’s traditional luxury cruises and its expedition ships. It is capacity controlled and subject to availability, Silversea said.

Among the cruises for which it is offering a $1,000 offset towards the cost of shore excursions, spa treatments, specialty restaurants and boutique purchases is an 11-day Silver Wind voyage between Singapore and Hong Kong in late February.

Among those for which it is offering a $500 credit is a 10-day trip in early June between Rome and Venice on Silver Spirit.

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