As Foursquare has shown so far, gaming elements are an intriguing part of location-based services. And more recently, Gowalla has started moving more towards that space as well. And just in time for the holidays, they have a new game that can earn users presents. During what is calls "The 10 And A Half Days of Christmas (Because 12 Days Were Too Predictable)," Gowalla is giving away gifts to users who do one of two things: 1) Follow Gowalla on Twitter and tweet in 140 characters or less about why they should receive a prize.