Riptide, 1998, Douglas Preston and Lincoln Child
Considering that Preston and Child books really, truly feel like they are sometimes written to get a film deal, it’s a little surprising that the only one that ever really got made into a movie was the horrible film version of Relic that cut all the good bits out anyway. This is the book that really stands out for the lack of a painfully obvious film version. Pirates, buried treasure, big action set-pieces, and a ready-made “based on a true story” ad campaign. That it’s actually pretty good* is a bonus.
*: in the context of “books you read on planes or on vacation”