Hibiscus, bulbine, palms (they should bloom there), canna, oleander, hymenocallis(spider lily), crinums, petunias are all planted here along various properties on the Seawall and do just fine. If I think there is a list on the Texas A & M Website.
Tally HO!

My wife had luck with hydrangas and azaleas on her families former beach property. They were planted fifty feet from the seawall, and with about a 30 foot elevation, some of the highest land on the Mississippi coast.

This home was on Ocean Springs beach which is brackish, and with small waves, (unless a storm came a shore) so this info might not apply to your situation.

Send a email address and I will scan a copy of belt 1 and 2 plants for growing on the seashore. Exposure to salt spray. There is not a whole lot that can take direct exposure.

Some of my favorites on the list are belt 1- Lantana, cape honey suckle, russian olive, rosemary they can be washed by sea water occasionaly

belt 2- Asiatic Jasmine, regular honeysuckle (lonicera japonica) Day lilly,Zinnia, rose mallow( hybiscus, geranium, moss rose, Oleander, Vibrum, and your palms. These tolerate salt spray but usually will not live if washed with sea water like in a storm.

Might also be a good idea to see what others are growing that way you can easily find a source. A good nursery should have all the items needed. They will need the 5 gallon type if they are going to make an impression on a wedding this year. Use some superthrive to get them started fast.

The University of Florida has a website that has list of plants that are salt tolerant. I do not have list with me but you can google---salt tolerant plants and University of Florida

I have had great results with Rugosa roses as well as the other plants listed here.

And the rugosa's offer the sweetest fragrence as well.

Janie

Dune sunflower

Here is a link that might be useful: Dune Sunflower