If you enjoy to go mountain biking, you need to go in beautiful Colorado. There are hundreds of thousands of moutain bike trails spreading through Colorado. Whether you are a beginner or an expert you will be sure to find a challenging trail in Colorado. Check out www.bikecolorado.com for a list of trails.
Her is another great site for mountain bike trails in Colorado: http://www.dirtworld.com/trails/ColoradoMountainBiketrails.asp (MORE Colorado Vacation ideas)