Calvin,
We go the same times every year. The temps for Cancun, Isla Mujeres and the Riviera Maya in late April / early May were 82-84. I wore a 3/2 full, my dive buddy had a tshirt and swim trunks (he is also bald and no hood). I was comfortable to warm, but i liked the idea of protection from a full suit. After I had it on, I was fine. My dive buddy was fine too. Back during our October/November trip he bought a 3/2 shorty and loves it. Seeing where you are from, the water should be like a bathtub! Most people I talk to are fine with a 3/2. A skin is ok but you may tend to get chilly on extended deep or repetitive dives if you don't get a chance to dry off or warm up during your SI.