Every time before my travel, I usually spend lots of time to arrange my schedule, especially for the self-tour. Not only read more information about the destination, but also consider when to start and where to stay and what means of transport, sometimes need make reservation in advance. In my experience, if have a travel in a strange but modern city or want to have a travel line from a city to another city nearby, choose the local bus sightseeing tour is a better way. Athough there are many others options for the city trip for example taking bike, on foot even helicopter. Maybe you have your own favorite, but bus sightseeing tour is more ralax and easy.
General to say these company supply many classical and attractive tours and trips line to you, and it almost include the most of the famous or typical spot in this city. It not only save your time but also the money.