The first place I'm suggesting couldn't be any other than Fernando de Noronha.
The island has so many beautiful beaches, there are attractions for people who just want to chill but there is also place for the ones who likes adventures, like swimming with sharks for example.
Night Life is not that busy, but there are 2 great dancing bars where you can hangout and meet new people.
There are great restaurants there, and you can try all different kind of sea food, most of them are English friendly.
The island is perfect for any occasion, you won't regret if you decide to visit it.
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Tá aí uma coisa que eu não penso e raramente sinto. Diversão é um mundo distante pra mim. E o mundo está viciado em diversão, então isso já me faz sentir à margem de tudo.