Every Zelda title I've played, mostly Wind Waker and Ocarina of Time because they were the first two Zelda's I ever played and they bring back good memories. I remember never having the guide for OoT, so I was stuck a lot. I was always stuck on the first dungeon (I was only 7, after all haha) and I always wondered what awaited me outside the forest. I remember venturing off into the Lost Woods when I got stuck on something in the Great Deku Tree and stumbling upon an entrance to some other rocky area, but I was unable to explore because of the three giant rocks in my way. I always wondered what was beyond those rocks as a kid and now I know it's only the Goron City.
I'd also love to play the original Animal Crossing for the Gamecube again, also for the same reasons as the Zelda games I mentioned above.
Some other titles I wish I could play for the first time are:
-Paper Mario: The Thousand Year Door
-Harvest Moon DS and DS Cute
-Super Smash Bros. Melee