This is part 30 of my 100% Super Mario 3D World Walkthrough. Below are the times for the green stars and stamp in this stage.
00:08 - World Star-Toad - Captain Toad Takes a Spin
02:41 - World Star-8 - Peppa's Fog Bog
04:38 - Green Star #1
06:10 - Green Star #2
06:30 - Green Star #3
06:53 - Peppa's Fog Bog Stamp Location