Entry location: Duty Free Shop
Muster up all of your patience if you want to earn a huge stockpile of Mileage Points. But the only way to do so is to have already completed 5 of the Solo Cruise levels. First, select the "Solo Cruise". Then pick the Bowser's Enchanted Inferno stage, the last level. You'll need to get a Star and somehow avoid all of Bowser's traps on the board and reach the central island, which is your starting point. There, you will challenge Bowser in a great showdown. If you can defeat his task, you will earn around 700 or more Mileage Points at the end, not only for defeating your rival but big bad Bowser, too! However, this takes quite a while, for Bowser may sink the island with the Star into boiling laza during the game. Plus you have to worry about your opponent getting the Star first. If they do, another Star will appear somewhere else. It's up to you to get it and race to the island before your opponent does. If your rival beats you to it, don't worry: he'll probably lose, since he's on the "Weak" setting. You'll have as many chances as you need before you use up all of the turns to overthrow Bowser, but if the turns are up, all the hours of clawing your way up will have been wasted. Watch out for that and good luck!