To complete one of the Storm Race challenges, you will need to dance in front of various telescopes that can be found on top of certain mountains on the island. You will therefore have to go to these high places, stand in front of the present telescope, and dance to complete the challenge.
Map made with Lootlake.info
For this challenge, you will have to go to three points on the map in order to dance in front of three different telescopes. You can complete this challenge in 3 parts, but the Prestige version will ask you to face two of them to dance there in one part.
As a reminder, it's easier to complete this challenge in Team Rumble, then with respawning, you won't have to worry about dying.