Crystal Cruises said guests can bring a child 17 or under free when booking select fall sailings this month.

And, family groups of six or more can qualify for $400 in onboard spending credits, as well as a $500 credit toward a Crystal Private Adventure, family photo and other benefits offered with the line’s “Crystal Family Memories” program.

The offer applies to seven sailings on Crystal Symphony and 10 sailings on Crystal Serenity between Sept. 1 and Dec. 31. It is set to expire at the end of April. For children to sail free, they must be traveling with two full-fare adults.

The sailings range from several seven-day Canada & New England or Caribbean sailings up to a 15-day holiday sailing from San Juan to Rio de Janeiro.

Crystal said its luxury ships include purpose-built Fantasia and Waves children’s and teens’ facilities, as well as events and top video games and toys that would add appeal for children.

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