No reason to worry. I've been three times in April. It's a lot more bearable, since it's less hot and sticky. Bring just a pashmina or something to cover, just in case it should cool down a bit in the evenings.
You'll have a great time. Where exactly will you be staying on the island. Could make a little difference. The Eastern coast and the South may be a bit more chilly, since more windy. The Nordwest should be perfect though.
Also, the risk of cyclones in April ist close to none.
Have a great holiday!
**Mo kontan Moris**