Instructions
Go to the park and look for the cat with a swimsuit and a cat with a parka.
Pet the cats wearing the swimsuit and parka. Give them toys to play with to increase your friendship. When your friendship with the cats is full, a happy face will appear in the upper right hand corner of the lower DS screen. It may take several days in the game to befriend the cats.
Go out onto the map, then enter the Park again. Talk to the cat with the swimsuit and the cat with the parka. They will give you a swimsuit and parka.
Leave the park and look at your map. The beach and mountain will be open.