Big Lagoon Access provides entry to a 1,600-acre brackish water lagoon and marsh system via Big Lagoon County Park, located seven miles north of Trinidad off Highway 101.

The park offers a boat ramp, day-use beach access ($5 per vehicle), camping (25 first-come/first-serve sites, $30/night), and kayak rentals, making it suitable for both boating and paddling recreation.

Note that winter/spring surge channel flows may make the barrier beach inaccessible from the north; an alternate route via Highway 101 is available when conditions prevent beach passage.