I went there two years ago with Princess and did all excursion myself.
Two things that I would like to mention here:
Seward - Kenei Fjords NP. If you have any kind of sea-sick or car-sick, even just a little bit, don't go. A boat (can hold probably one hundred people) will take you to the sea for 6 hours and the ride will be rough since the boat is not big enough for the sea wave. If you have any knid of sea-sicek or car-sick problem, your life will be miserable. That was what happened to me.
Exit Glacier (outside Seward) - You can walk on the Glacier and even touch it. I don't know any other glacier that you can do it. The whole tour takes probably one to two hours and the road is not rough at all.