Oso Flaco is a fairly long walk and then a steep hike up a soft dune to get to the photogenic places... I access the Oceano Dunes on the very northern end.
If you stay at the RV park that is actually IN the dunes near the Arroyo Grande Creek you can literally step out of your RV into a fairly photogenic scene (footprints permitting) My photos were shot a fairly short distance from there.
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