Calorie Tracker (free): My Fitness Pal (free app available on mobile)
GPS Tracker (free): Map My Ride (free app available)
Geo Caching (free): Geocaching ($10 app or use a GPS unit)
What is Geo Caching?
Geocahing is a real-world outdoor treasure hunting game. Players try to locate hidden containers, called geocaches, using GPS-enabled devices and then share their experiences online.