You are under an abrasive sun, and then, suddenly, the sky gets dark, a wind sweeps the beach and you are caught by a freezing and heavy rain.
That's the tropics, and after some minutes everything is dry again, the sun shines and people gets back to laughing. We had it in Maragogi, while in catamaran, and... when it stopped it was fun. But I heard (and found in Recife) that even in the tropics, sometimes the rain may be boring, so you better take the weather in mind when deciding to go.
I use to say to Fernanda that, in the tropics, the sun is dangerous even in the room, at midnight! We always forget that moving here and there we are under the sun. Swimming, we are under the sun. Even staying in the shade, the reflection in the water... keeps burning.
We are mature, experienced and careful. We can't bypass the pealing skin, but watching some serious scalds in people around us, we feel obliged to a repeated warning: careful! It is your skin and your health...