A sunfish.
(of weather or a day) Featuring a lot of sunshine.
Whilst it may be sunny today, the weather forecast is predicting rain.
(of a place) Receiving a lot of sunshine.
I would describe Spain as sunny, but it's nothing in comparison to the Sahara.
(of a person or a person's mood) cheerful
a sunny disposition
Of or relating to the sun; proceeding from, or resembling the sun; shiny; radiant.
Sunny side up