Pocket Card Jockey is a 3DS eShop title you can pick up for like $6. In it you are a jockey riding horses in professional horse racing, but you suck at it, so by some magic power you are able to play a version of solitaire instead which powers your horse. It's super weird but also really really good.
The solitaire variant is perfect for it too, because it's super simple. All you have to do is tap a card on the touch screen that's one below or one above your current card. Suits, colors, all that stuff is thrown out the window in favor of simplicity and the game is all the better for it.
Plus you're racing and growing your horse. There are sections in each race where you use the power you've gotten from solitaire to choose how your horse moves in the race or how it's positioned around the other horses.
There is actually a bunch of strategy and a couple different mini games in each race.
It's the perfect game to sit back and relax with in short bursts. After the initial excitement of the first week or two I find myself picking it up for about half an hour at a time and having a great time with it.
This is probably going to be a good backburner/evergreen game for me for awhile. Especially for the next time I travel. I highly recommend pocket card jockey to anyone with a 3DS. And it's only a few bucks, which makes it even more appealing.