They are called Excursions - and the costs varied depends on the contents. However, generally speaking, cruiseline's tour prices are 2 to 3 times more than if you do-it-yourself - that is just natural. You pay for the convenience.
You may want to go to this site to check out your ports and read the introductions to gain some knowledge.
http://www.cruisecritic.com/
Under Destination, you should find most of the basic info you need.
You may also want to explore that site, particularly the articles for cruise newbies. Then the message boards are where you go ask more specific questions - you will gain far far more information than asking here.
You may want to go to this site to check out your ports and read the introductions to gain some knowledge.
http://www.cruisecritic.com/
Under Destination, you should find most of the basic info you need.
You may also want to explore that site, particularly the articles for cruise newbies. Then the message boards are where you go ask more specific questions - you will gain far far more information than asking here.