Deal watch: Save on Hawaii, Mexico, West Coast cruises

Small-ship line Un-Cruise Adventures is kicking off a promotion today that brings up to $500 per couple in savings on select voyages.

The three-month-long offer encompasses 2015 sailings in the Pacific Northwest, Hawaii and Mexico's Sea of Cortés.

Under the terms of the offer, customers will save $400 per couple when booking a spring Columbia & Snake River cruise on the line's 88-passenger S.S. Legacy. Fares for the sailings start at $3,195 per person, based on double occupancy, before the savings.

The savings rise to $500 per couple for the line's spring and fall coastal Washington sailings on the 22-passenger Safari Quest and 60-passenger Wilderness Adventurer, with a caveat that the deal only is available for parties booking three cabins on the same voyage. Fares for the trips on the two ships start at $3,695 and $1,695 per person, respectively, before the savings.

For Hawaii sailings, the offer brings $500 per couple in savings on departures from January to April. Fares for the line's Hawaii voyages start at $3,595 per person before the savings.

For Mexico sailings, the offer brings $300 per couple in savings on departures from January through March. Fares start at $2,995 per person before the savings.

Bookings must be made by Dec. 30.

For a deck-by-deck look at an Un-Cruise vessel, click through the carousel below.