City Tours is a Google Labs’ experimental project that could become a part of Google Maps and "helps you identify points of interest and plan multi-day trips to most major cities. You just specify the location of your hotel and the length of your trip and City Tours will map out an itinerary for you," explains Google. For now, City Tours doesn't offer too many interesting features: it only lists popular sights and it suggests when you should visit them. You can edit the information about a place and you can add new sights, but the options are very limited.