new 77, just go and enjoy your cruise. There is no pressure to tip on excursions. When get a real nice tour guide or bus driver, you can tip them if you like. Sometimes we tip them a dollar or two and at other times more if we really enjoy their service.
This has nothing to do with the cruiseline. We also tip tour guides and bus drivers when we do land vacations.
Carnival Liberty New Year's Eve 2007
Liberty of the Seas 5/2008+11/2009
Allure 1/16/ 2011
Vision OTS 2-14-2015
Freedom OTS 3/6/16