This seems quite similar to Geocaching - did you take inspiration from it? In fact the only differences seem to be that there is no physical object at the destination, and that it's a race.
SuperTrip is very inspired by my personal experiences geocaching. I always loved geocaching but hated the hide-and-seek mechanics of it. I've spent way too many hours searching for a geocache once I was at the destination and often giving up. SuperTrip is my personal answer to that. Rather than use a GPS location, SuperTrip is only a direction and distance. The location is abstracted so you don't know where you are going but at the same time, the final destination isn't hidden. For me, it made it more of an adventure. Plus, once you reach a destination, you've made it. There is nothing physical at the locations, and the first version is only a pat on the back, but the goal is for there to be in-game rewards for reaching destinations. I just haven't developed all of that yet.