We are about 700 feet to beach and did not go all native. Had a goal of varied color/texture and no watering requirement. We did have to water occasionally when yard was getting established. Has been about a year I would say at this point. Never requires water now. Some things go dormant in winter with less rain but perk back up for the summer. 

Dune Sunflower (yellow flower) is main ground cover. Also includes: Blanket Flower (red/orange) which puts out seed and pops up in various places now including my neighbors lawn. Bushes are Texas Sage which have nice purple flowers that come and go all year. Native Necklace pod with yellow flowers.  Blue Daze (purpleish Blue) come and go with rains. Rounding things out are a few Coontie, Muhly Grass, Cardboard Plant, Coconut Palm, and some decorative fat lighter chunks we found on the Withlacoochee River on a canoe trip that we dragged back with us. "Protect Our Lagoon" florida friendly yard sign courtesy of Project H20 in Volusia county. We put down pine needles to keep the weeds down. Was more of an issue when things were getting started but less so now.