While you are admiring the magnificent ginko tree at the Hosokawa Gyobutei Bus Stop, wander along behind the natural history museum / planetarium (or better yet, drop in and then wander behind it) and up the path that leads to the back of Fujisakidai baseball stadium. You will find some amazing ancient camphor trees looking very venerable and noble. I love living in a country where trees are National Treasures. Also, the Gyobutei gardens are not open now, but will be open from the 20th for their annual fall foliage light up (from 17:00 to 21:00 I believe)