We did this same cruise in 2005 on the Radiance. It was wonderful!!! We also stayed at the Hyatt and loved the restaurant upstairs, Mosaiacs. We went on the double decker bus tour which takes you all over the area, 21 stops, including Granville Island, Gastown, Chinatown. You can get on and off ALL DAY long. We bought our ticket, $30 US, at the Hyatt's conciege desk with our credit card which does the $ conversion for you and the ticket is good for 2 days. We use the 2nd day 5 months later! The double decker bus stop is right out the door at the back of the Hyatt down the escalator, very convienent. There is another tour bus of the city which covers the same area but we were having much more fun than they were and for half the price. Enjoy!
Edited to add website: http://www.gotobus.com/graylinevanco...2_daypass.html