It is not a “club,” but, there is some swinger activity at some remote beaches. Here is a discussion board, for activity at the beach between High Island and Sabine Pass. One does need to pay attention to the tide times, and, it is best to have 4-wheel-drive, along with knowledge of how to drive on sand. This site seems to have a gay bias, but some few participants are couples.
https://bolivar-mcfaddin.proboards.c.../general-board
Using too-explicit language can cause the site to be locked. A companion site, specifically for heterosexual couples, was permanently removed, because explicit description of activities were being posted.
This is the beach favored by my 1996-1997 girlfriend, described in an earlier post.
Keep in mind that total public nudity, and public lewd conduct, is NOT legal. If within the boundaries of the National Wildlife Refuge, the rangers/wardens WILL cite or arrest folks.