My wife and I are planning a June 2010 Alaskan "Voyage of the Glaciers" cruise from Vancouver to Whittier. We are first time cruisers, and are trying to decide between the Island Princess and the Diamond Princess. We are 45 and will not have our kids with us (but don't mind kids around either). I have read some reviews and don't believe there is probably that much difference, but would like to read any suggestions you have. Thanks in advance!