I had the game for DS. I can't actually remember what the goal of that one was, but as far as I remember, the one I played had no building in order to progress. (unlike PC and I'm fairly sure the Wii one as well) I spent hours of my day fishing, playing tennis, decorating my house (I was so excited when I got the big 3 bedroom one!), and buying/designing clothes. I really miss that game. I might purchase an old DS and the game just to play it again! And maybe nintendogs... I loved nintendogs.
Edit: Oh, and I also loved sims castaway for both DS and Wii. They were so much better than castaway stories for PC, you actually had to build your own home. I need to get that one too. :p