Dreamcourse is like a golf game. It's really fun. Like golf, each stage has a set par you try to make/beat. But you have to knock out all of the enemies on the stage, before you can knock Kirby into the hole. Knocking into some enemies gives Kirby abilities to use during a shot (I.e, using the Tornado ability allows kirby to hover for a while, spike allows him to insta-stop,etc). You have to use these abilities to make it across some of the stages.
The first stages get you warmed up to the whole game, and then it gets pretty rough. Again, you try to clear the stage in as little shots as possible. This is the addicting part, because you keep trying new ways to point and shoot Kirby. By aiming right and "chaining" enemies you can do some very impressive shots. Here is a video of someone Hole-in-One'ing the first course:
http://www.youtube.com/watch?v=EUic46uZwj8
I'd recommend it if you have points to spare.