Most cruise ships have a couple premium resturants with great views and cost a few bucks more than the free buffet lines. Seating is limited and reservations go quick. I'd recomend getting reservations for a window seat while the view is good. We ate while at hubbard glacier and it rocked. Be aware that much of the inside passage is so wide there isn't much of a view, when your getting close to your ports may be a better choice.
Also, you may be tempted to do a whale watchers tour, we booked one before we went and then saw lots of whales from the ship, so it wasn't as big of a deal. Also, on a couple of other tours we did, we ran into whales as well. It may not be worth a special trip to see them. If I were to do it over, I'd skip that tour.
Try to find some fresh white salmon cooked over a fire up there, it's amazing.
Bring your own cigars as selection on the ship sucks and is pricey. Small smokes are best as in the dry air a longer smoke is likely to split, unravel, fall apart before you finish it. If it's cold or rainy you may have a hard time staying outside long enough to enjoy a long smoke anyway.
If you go on any of the tours that are the canoe by a glacier, hike in the woods kind of thing, take some candy, fresh fruit, etc. with you. Those kids don't see much of the world and it's a far better tip than money.
I might think of more, and if you have questions let me know, I did that inner passage cruise four years ago.