If something is sunshiny, it means it is bright and sunny, like when the sun is shining.
Sunshiny makes people think of happiness, warmth, and good times.
Examples:
It's a sunshiny day outside.
The sunshiny weather makes me feel happy.
I like to play outside when it's sunshiny.
The sunshiny day makes me want to go to the beach.
The sunshiny weather makes everything look golden and warm.
I love to have a picnic on a sunshiny day.