Hibiscus and azaelas...bouganvillas(which can be invasive)...bouganvillias are happy being root bound and in pots....so watch planting them freely in your lawn unless you have plenty of room..and keep pruning them to keep under control...also night blooming jasmine is veryvery nice and flower at night..but you can smell the perfumed scent of the flowers for 2 or 3 blocks...
I lived in the Florida keys for 6 years, sub tropical...but all these plants I personally had..