Briggs Boardwalk is the short walking trail into Rookery Bay, reached down Shell Island Road off Collier Boulevard a few miles north of the Jolley Bridge. Half a mile of raised timber crossing five distinct habitats in quick succession, ending at an observation deck over the bay, it has been the easiest way for anybody without a boat to stand inside a mangrove system rather than look at one from a bridge.
It is currently closed. Rookery Bay has had the boardwalk shut for renovation with no announced reopening, and guided walks on it have been suspended for the duration. Check the reserve's own listing before you make the drive, because the structure has been out of service for long enough that plenty of maps, apps and travel pages still show it as open.
What is still open is the rest of Shell Island Road, and it is not a consolation prize. The road itself runs west off Collier Boulevard through mangrove and salt marsh on an unpaved surface that a rental sedan can manage slowly. Birders drive it at walking pace with the windows down: this is reliable ground for wood storks, roseate spoonbills, white pelicans in winter, ospreys and, with luck, a bald eagle.
At the end sits the Shell Island Road boat ramp, open dawn to dusk, which is the best kayak launch between Naples and Marco Island. From it, Monument Point Trail runs to a small monument on the bank of Henderson Creek, and the creek itself is a popular shore-fishing spot.
One planning note that catches boaters out: the shoal and beach areas out here, including Second Chance, close entirely from 1 March to 31 August for nesting shorebirds. No landing, no dogs, no fishing from the sand.