A little information
I don't know if people in this forum are interested in this kind of things (I'm not non-Japanese, so I don't know what you find interesting,) but I found it in the publication of the Nagoya city hall. If you'll be in Nagoya or around on 18 Mar, you can enter and look around
in Tokugawa-en for free (9:30-17:30.)
Sorry, but I personally have never visited there, so I cannot tell how the place is like.
Here is a link that might be useful: Official Page of Tokugawa-en (in English)