Just like Alice In Wonderland! A sort of circular course, everyone walking, running, and biking in their own time, round and round, they go, avoiding each other as best they can. So at some times, there will be muggles galore, and this is such an open area, you will be seen from some distance away. Watch out for those fast riders!
However, you do not have to stand on the track to find the cache, as it is located on the island between two tracks.