Nevado writes:
... I'm sure Eddie will have some info there, he appears to be the Huelva expert!
Not an expert, but I've been there a few times visiting family at their beach condo in Mazagon. It's called a National Park but I view it as more of a wildlife (migratory waterfowl) preserve. It's just west of the rio Guadalquivir in Huelva Province. The
Santuario de la Virgen del Rocio is right at its edge. Don't even dream about going there the days leading up to Pentecost Sunday (19 May this year). That's when the
Romeria (aka
feria del Campo) happens - they say there were a million people taking part last year (when I was nearby). Not too many places to stay around there: a Parador in Mazagon; there's a new Golf Resort - I think it may be in Matalascaņas.
Cousin told me that at low tide some 4-wheelers drive across from Sanlucar de Barrameda.
I wouldn't try it.