Which trail would be safest to alternate between running/sprinting early in the morning? I was also told there was a running track at the park somewhere?

Any trail will work for you at this park

Start left to right, it'll take you to the running track while getting a warm up. Enter the park, take the first left then park. You'll find the trail as there are many trails that lead the same way.

There is an upper and lower section at Hahn. At the upper section there is a track (longer than 1/4 mile circumference) although it is not always level.