A lot of people hear "dunes" and they think of rolling hills of sand. That's what dunes of the Sahara might look like, but dunes here at the Jersey Shore are more likely to be berms of sand positioned in front of boardwalks, with grasses planted in them. The dunes here are also fenced off, and signs warn people that it's against the law to walk on them. They aren't ornamental parts of the landscape. They're barriers built to lessen beach erosion and to protect the boardwalk and everything beyond during storms the likes of hurricanes and nor'easters. Dunes covered by thick grass and other vegetation are also habitats for shore birds and migrating birds.
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