There's been at least 3 suicides in Veteran's Park in the last 5 years or so. It's secluded and nearby, so it makes sense to search there first. But honestly, within an hour's drive, there are literally thousands of secluded places, from parks, wetlands, fens, river flood plains, conservation areas, gravel pits, railroad tracks, rural farms and farm roads, and woods/thickets. And I imagine that people involved in drugs know of all the secluded places to go that aren't regularly patrolled by the police and where they won't be seen by neighbors or dogwalkers, etc.
Not knowing how long little AJ has actually been gone, it will be like looking for a needle in a haystack unless they break and give a location.