These plants can be used as ground covers in sunny areas that are exposed to some salt spray:

• Sea purslane- Sesuvium portulacastrum
• Prostrate cocoplum- Chrysobalanus horizontalis
• Beach creeper- Ernodea littoralis
• Trailing lantana – Lantana montevidensis
• Beach Morning Glory - Ipomoea pes-caprae
• Golden creeper – Ernodea littoralis

You can search for additional ground covers or other types of plants using the Florida Friendly Plant Database http://www.floridayards.org/fyplants/index.php

Additional Resource 

http://edis.ifas.ufl.edu/EH138

http://edis.ifas.ufl.edu/EH139