Mention of palmettos reminds me that it was reputed to be one of the last areas the Andalucian Hemipode could be found near Jerez. When Roger Tory Peterson joined Mountfort et al on one of his expeditions to paint and familiarise himself with European birds for his forthcoming field guide this was a species he was keen to see. He succeeded in doing so but only because a barber in Jerez had one in a cage, perhaps it was caught here.
It's c2.5 km from the city centre so should take c30 mins to walk there. Happily, however, the No13 bus runs to the laguna and both the No 8 & 9 stop in Ave. Puerta del Sol from where it's a five-minute walk (along Calle Austria & Ave. de Italia). Even on my very brief visit I had Little Egret, Night Heron, Spoonbill, Black-tailed Godwit, Green Sandpiper, Red-rumped Swallow, Cetti's Warbler, Common Redstart, Pied and Spotted Flycatchers. A check on e-Bird shows that 110 species have been recorded here including Purple Swamphen, Little Bittern, Bluethroat and even Red-knobbed Coot (see - https://ebird.org/hotspot/L12777970) The north-western arm of the laguna seemed to offer most promise with reeds and exposed mud offering cover and a source of food for passing birds.