Here is a link to a site with lots of information about escorted tours and transfers within many cities worldwide. These tours can be of half day, full day or multiple day duration. Transfers can be from hotels to airports or transfers to nearby cities or resorts for a short stay. Please select the country and city of interest to you.

World Tours Guide 

 

Here is a link to a site about escorted tours and self drive tours in Usa.

USA Tours