Biano Hills is a peaceful country setting, with windmills and a stream. When you first enter this level you'll meet a sunglasses guy. You can't use the glasses until you have 30 shines so ignore him for now.

Most coins here are very obvious. If you water all the flowers in a given set, you'll usually get coins for that.

This is just the starter level, so they make it easy for you. Mostly you're having fun playing on the ropes, watering the flowers, swimming in the water. Eventually you should find your way to the windmill. Just destroy the ball-making spot from the safety of the water, and a plant will appear. Hit him 3 times with his mouth open, and a ramp will come down. Grab the shine and you're all set!

Super Mario Sunshine Walkthrough