Hope I am helping you but once a young boy and coming there since 1973 and knowing what you are taking about I think you might want to look into the 800 loop. I believe and check on this; has the old railroad track path which is now a walking path. Not paved. But the kids could play back there and explore with getting into to much trouble. Just a thought. You can also look into the 1500, 1600, 1800 loops. They back up to the river. Might be fun to. But, some of those loops share comfort stations so be careful where you pick you site.