Smyrna Dunes Boardwalk is a 1.5 mile loop in New Smyrna Beach, FL that runs along the coast of the Ponce de Leon Inlet. The boardwalk has several places where you can step off onto the actual beach, or you can drive straight onto the beach and park there.
There is a $10 entrance fee, which seemed a little steep to me, but if you live nearby you could buy a $20 pass instead and visit as often as you want for the year. The nicest thing about this trail is its pet friendliness — there’s actually an entire section of beach just for dogs. Sadly, when we visited the animal access beach there were no pups to witness, but it was also a bit chilly and it looked like it might rain. If you do bring a pet, at the end (or beginning, depending on where you start) of the trail there’s a pet washing station to get all the sand and salt off.