Six months ago, Google launched City Tours into Labs. It's basically a virtual tour guide, offering suggestions for walking tours of various cities or whatever search term you've entered. It's not perfect. There's no way I'd recommend people walk down Google-recommended McDowell street in downtown Raleigh when they could - and should - take Fayetteville Street. But hey, it's still in Labs.
Show complete walking directions. Previously, Google estimated the time it takes to get from one destination to the next. Now, the directions offer complete routing information, taking into account such things as bridges, bodies of water, etc.
Import a My Map as a tour - Create a map of the things you want to see. Then import it into City Tours, which will attempt to schedule a visit to every place on your map.
User interface improvements These were designed to make City Tours behave more like Google Maps.