You won’t see much of the actual palace. (An application and reservation are necessary for a tour.) It’s closed to the public (except on New Year’s Day and the Emperor’s Birthday on Dec 23), but parts of the exterior can be viewed from the Nijubashi Bridge; the wide moat stocked with koiand lined with cherry trees are perfect for an afternoon stroll; the Higashi Goen (East Garden) marks the site of old Edo Castle and has wide paths for walking.