What plants should I plant in a Caribbean garden?

I live in Puerto Rico: so very high humidity, hot temperature and a very very very hot sun on daily basis. Still half my garden is under this big tree that allows little to no sun through. So...what plants or preferably what flowers may I plant in the undergrowth? I’m not really good with plants. So after the Hurricanes hit us hard I make a daily task to sprinkle plant food and to water the whole patio in an effort to keep the areas I’v been able to plant and keep some plants, as well as an effort to prep the soil underneath that big old tree...So your knowledge and advice is greatly appreciated!Sincerely, Green Thumb Wannabeheidi_medina67@hotmail.com