Spiders in Key Largo.
#1 and #4
Golden silk spider Nephila clavipes
The golden silk spider is found throughout Florida and the southeastern United States. The female is distinctively colored, and is among the largest orb-weaving spiders in the country. The female is 25 mm to 40 mm long and has conspicuous hair tufts on her long legs. Males are about 4 mm to 6 mm long, dark-brown, and are often found in the webs of females. These spiders feed primarily on flying insects, which they catch in webs that may be greater than a meter in diameter. They are most commonly found in forests, along trails and at clearing edges.
#2 and #3
Spiny orb-weaver, Gasteracantha cancriformis
The spiny orb-weaver spider is one of the most colorful and easily recognized spiders in Florida. The dorsum of the abdomen is usually white with black spots and large red spines on the margin. Females are 5 mm to 10 mm long and 10 mm to 14 mm wide. The webs typically contain tufts of silk, which may prevent birds from flying into them.
Pictures are mine, species information from: