If you like mud and lots of exploring, then maybe Playa El Aguillito is worth a visit. This is a migratory stop for thousands of birds. The small park at the entrance is not very impressive and the road going through the Sanctuary is lined with litter. But Playa El Aguillito serves its purpose for the birds. The park just needs a good clean up and it would really be nice. Evidently there is a ecological station in the park, I didn’t stay long enough to locate it.
I stopped at this point of the road. It’s up to you from this point to see whats ahead.