To get the 2.5 on the Dance bonus every time hold the Wiimote by the safety strap and twirl it around like a plane's propeller until the time runs out.
Easier questions
Make a new Mii or use a guest. When asked to enter your age, instead of using your real age, enter a relatively small number, such as "2".
Spin the wheel very fast without exerting physical energy
To spin the wheel without cranking it, hold A on the Wiimote and make a quick downward movement. When you are done with the movement, quickly release A. If done correctly, it will spin the wheel very fast without wasting any energy cranking the wheel for a very long time.