My neighbour brought her 2-year-old to Florida in December and said it was perfect, she did Clearwater beach for 3 nights, then Sanibel Island, then Great Wolf Lodge in Naples which her toddler absolutely loved lah. Someone in my mum WhatsApp group also mentioned Puerto Rico as a great option, easy flight, kid-friendly food, nice beaches, even rainforest hikes that are manageable with small ones!