Astro Avenue is one of the Solo Mode boards in Mario Party 6. The player starts all way on the left on Earth and has to make it all the way to the end.
The board is a mix of minigame spaces with the planets having events. Most of the minigame spaces are 1 vs. 3. On the UFOs are Event Spaces where UFOs will take the player and warp the player closer to the end. The Koopa Kid space towards the end will warp the player back to the beginning essentially losing all progress