What would also be great would be something where one could set up one's own course of flags or ballons and share them with friends. Think how much fun it could be, hiding the ballons and then letting other people on this forum try to find them and try to get through the new course in the least amount of time!
And, for those who like a bit of violence, how about a bike game where one can run down Miis. I find annoying those Miis standing there clapping when I'm cycling. Why are they just standing there? Why aren't they working out? At the very least, it would be fun to make them run away and chase them around. But they let the obstacle course squash one's Mii, so why not allow the bike to squish the other Miis? All in the name of exercise, of course.
