I take my 3DS with me sometimes. Just when I feel like it. I've only started that recently; I used to never, ever take them for fear of losing them. After that, I only started taking them when we had a shortened school day or shortened class periods. These days I take them when I want to -- when I was playing through Rhythm Thief and the Emperor's Treasure, I brought it to school everyday, and the same is true since A Link Between Worlds's release. And if I know I'm going to have a boring day, I bring it sometimes. I usually get a lot of StreetPasses (five or six) and take over 1000 steps, so it's nice when I get to bring it.