Retraction

After a few minutes perusing the jPg I have determined that we were not at the same beach, but very close. I now give you the jFrog's picture to compare.All the details of the gentleman's blog match rather nicely with what I recall of finding these ants. We found them in a tree just in front of the trail leading to the beach where we found the sand bubbler crabs. It doesn't seem that jFrog has any pictures posted of said crustaceans, misfortunately. However he does have a fine picture of the beach approaches.
My compliments to whomever took this photo of a sand bubbler crab burrow and surrounding demesne.