A boardwalk over dry land?
It seems odd to build a boardwalk on top of what, at first glance, looks like a perfectly serviceable track. During wet weather, however, this section floods and it can't be drained properly. Water damage mitigation is one of the big trail maintenance tasks for coastal trails, so it's important to identify problems during bad weather. Fixing water problems can require one or more techniques such as improved drainage (ditching), alternate route choices, raised tread, or boardwalks.