My friend from japan showed me this one. It's a large download for us westerners (250MB + 130MB updates) but the game itself is very fun.
There is no English interface, but it's easy to figure out and fun to play.
It's a golf game very popular in japan and korea. You can play with people online, and some of them even like to talk in english (albeit very pporly.)
You gotta register first.. I speak very very poor japanese but anyone who can read katakana can figure this one out.