Check out the games on the Garmin Geko 201. From the Web site:
"The Geko 201 also includes four fun, interactive games that transform the great outdoors into a virtual board game. Enjoy a good workout while chasing a virtual lizard in Geko Smak, match symbols in a grid version of Memory Race, navigate to reference points without crossing one's trail in Nibbons, and collect symbols along a path in Virtua Maze." ( http://www.garmin.com/products/geko201/ )