Look into "Pirate Latitudes" by Michael Crichton (Jurassic Park and ER).
Harry Harrison has a series of books like "The Stainless Steel Rat" if you want more of a sci-fi adventure.
Douglas Preston has a number of good adventure books that I like. "Thunderhead" and "The Ice Limit", "Impact". While not "swashbucklers" they are about guys who go off on adventures.
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