Hi Diane,
I too will be doing my first Alaska cruise on Aug. 30th from Vancouver, so can't really help with the excursions, there are so many good ones at each port, its getting harder and harder to decide. I bet you are having the same problem?? Lots of good information here, so just keep checking the boards and read reviews from returning Alaska cruiers soon, since the season just started.
In the meantime, you may want to post on the "meet on board" and see if you can find some of those other cruisers:
http://www.cruisemates.com/persin.cfm