I would not recommend this. The battery life is only 20-ish minutes. You have to account for wind, ups and downs and turns that will drain the battery a bit more. Think of jogging down a sidewalk, pretty easy going straight. Make a turn and your body has to put more energy into the outside leg. Same concept when operating machinery.
You also don't know if there are objects in the way there or back because there is a small delay from the camera to the controller for imaging, so by the time you respond, it may be too late and depending on how far the park is, you may really be late. Then being unaware of whom is attempting to knock your drone out of the sky is a costly price to pay.
I recommend being within eyes view of your drone to maintain control and accountability of it.