I recommend visiting - Mauritius, Mauritius
It has to be sunny Mauritius. I fell in love with this exotic island as it's full of white sandy beaches, dense forests and has a stunning and dramatic volcanic landscapes. It's a place where you can do as little or as much as you like, it's your choice.
Being a keen geographer, I loved combining my beach holiday with a visit to the geological sites of Chamarel Park, which features the Seven Coloured Earth phenomena (sand dunes comprising sand of seven distinct colours), as well as the impressive Chamarel Waterfalls.