At the very start of the course, you can look to your left and see some kind of ice structure. This star is trapped inside of it and you need to navigate the mini-maze in order to reach it. While it may be possible to perform a Triple Jump that lands you on top of the ice structure, the slippery slopes making up the roof make it more trouble than it’s worth, especially for how simple it is to get the star normally. Run around the icy structure and you will see an entrance on all four sides The entrance on the side closest to you from the start leads to nowhere.
Despite that entrance doing nothing, the other three entrances can all lead you to the star. Once you enter the structure, you will be looking for a spot where you can double jump. When you find that spot, there’s a ledge you can grab above you, so do that and you should be able to finally jump to the top of the icy structure. Upon reaching the roof, look for the other hole that’s nearby and jump down it to grab the star.