Just returned today. We are Minnesotans but we were thankful for having brought our fleece jackets, hats and gloves. Mine are the Nordstrom Echo brand, thin but wool gloves. My kids just had Target cotton/acrylic cheapie Gloves along and didn't complain. We used these last week in AM and at night on some days. We wore hooded sweatshirts to the park on the other days based on forecasts and put them in our bag when it got warm and took them out when the sun went down. Even before sunset it was cooling down as the sun was low in the sky, with shade everywhere. We saw sooooo many miserable people dressed for the tropics.
And we also wore shorts, Ts, and swam at the resort twice. People who say "layers" and bring a variety from cool to warm weather clothes are correct. We did not bring any sandals and never wished we had them. Late March/early April has been far warmer than our Feb trips, even at night.
We used a locker on our two longest park days to avoid carrying around some gear. Have fun!