You're just getting 8 red coins. This is practice with jumping on ropes and with the brand new Rocket Nozzel.

Go up on rope by entrance, then 2nd rope, then up. There are 2 red coins right there. The 3rd is in by the bells.

4th up around wall. 5th on rope between buildings near blue box.

6 is up on tower with rope with spinny red thing on it.

Now go get the rocket-nozzel on the back wall by going across the brick stick-out spots.

7 is between windmills, boost up with rocket

Last is up on top of twin towers.

Super Mario Sunshine Walkthrough