Have a great time Doug. Alaska is a beautiful place and the Inside Passage cruise is a fun way to enjoy the coastal towns. I've done the cruise twice (it is really easy for me since they sail right out of Seattle, 15 min drive and my vacation begins!).
The most incredible Alaska trip I had was taking the train from Anchorage to a Whittier in Prince William Sound where a boat dropped us off at a remote island about 14 miles away with kayaks and camping gear right next to the glaciers. The sound of glaciers breaking into the ocean was just awesome and kayaking around the floating iceberg was other worldly. There is nothing better than cocktails made with ten thousand year old ice! We kayaked back 14 miles over 3 days and that was probably the best outdoor experience I ever had. We even encountered thousands of pink salmon swimming upstream in a nearby stream and grabbed them by hand and threw them upstream over the rocks (wanted to help out
).
However, if you only have a couple of days in Anchorage, I would highly recommend Denali National Forest. It is an amazing place. Another place I would recommend is a drive to the Beluga point - the name does not lie!
During the cruise, I would recommend following:
Skagway White Pass scenic train - it goes from the port up the mountain to about 3000 feet. Incredible sites.
Ketchikan - Follow the mouth of the river and hike upstream. If the season is right you will see a ton of King Salmons swimming upstream. They are HUGE!
Juneau - tram is kind a cool (but also bit pricey)
Try the salmon bake at one of the ports. Nothing like freshly caught and prepared salmon.
But mostly, just sit back and relax. Many of the inside passage ways is quite narrow and if you have a verandah, you can just site outside your room and enjoy the views as they float by. You will have a great time.