To find aliens in Sandpolis head either southeast or southwest from the center of the city until you see lights.
To get the Coin Radar, you must first crack millionaire Keitel's safe.
The combonation is: 8 red, 3 blue, 6 orange, 1 green. These can be found on his son's paintings.
The coin radar allows you to spot coins on the map in the form of little flashing yellow dots.
Having trouble finding those 100 Choro Q coins? Well, if you open the rich guy's safe he will give you one of his many coin radars that locates coins on the map.
The mushroom needed for the purple van's "special" soup is right behind the godess pond in mushroom road.
To find Otami, you to wait behind the temple where the black bus says you can't enter in Fuji city until midnight. Then you push the black bus out of the way and wait for that box thing to slide away revealing the hole. I think you can do the rest.