Bethesda’s Marriott International Inc. has acquired Postcard Cabins with eyes on launching its own outdoors-focused collection next year. Terms of the deal, announced last week, were not disclosed. New York-based Postcard, which was formerly operated as Getaway Outposts, specializes in rural properties dotted with tiny cabins. Its properties are typically located within two hours of major metropolitan areas; it has two locations near Shenandoah National Park. The current Postcard Cabins portfolio…