Lisbon
Some possibilities here:
http://www.askmelisboa.com/site.php
http://www.viator.com/tours/Lisbon/Lisbon-Cityline-Hop-on-Hop-off-Bus-Tour/d538-2874LIS03
http://www.frommers.com/destinations/lisbon/0054020033.html
http://www.portugalvirtual.pt/_tourism/costadelisboa/
http://guides.travelchannel.com/lisbon