This Star is at the very top of the first vertical stretch. You need to use the Dash Pepper at the bottom and stay to the left, dodging the obstructions. About halfway up you'll be able to grab a ...

At the top of a palm tree at the edge of the deep lagoon is a Green Star. Make your way over to it with Yoshi. Side-flip and then add some flutter to the top of your jump to reach the palm tree's ...