Well I have not found "free ride" like the other games.
However, if you go to the 3rd option on the main menu "Trails" (under Tour, and Single race), You can pick race, Sprint, Freestyle. If you pick Race, you will be able to ride alone with no time limit, and no required jumps or anything. I use this for practice. I do not pick Freestyle b/c you still have to get items to keep going, and sprint is just a short run.