I have hidden a cache in Honmonji park, which is on a hill right next to Ikegami Honmonji temple. The park appears to be a popular spot for various leisure activities among locals. They can enjoy playing sports such as football or baseball, do a barbecue with family/friends or just have a rest and read a book while sitting on a bench.
When the weather is nice, the park may be quite crowded. However, the cache itself is hiden in a part of the park which is usually not much busy, which should give you some privacy for searching. But still ... please, look out before muggles. ;-)
It is a small box in the roots of a tree behind few pieces of wood. You do not need to get off path in order to find the cache.