Grande Dunes Marina is located at mile marker 357 
on the Intracoastal Waterway.

 

Also identified by Green Day Marker B-21.

Via US-17
 

Take Marina Pkwy to your destination - 3 min (0.8 mi)

Turn left onto 79th Ave N - 400 ft

At the traffic circle, take the 1st exit onto Marina Pkwy - 0.5 mi

At the traffic circle, take the 2nd exit and stay on Marina Pkwy