Shorts in Alaska in July?

I will be on a Holland America Cruisetour in mid-July, starting with the land portion--3 days in Denali before heading to Whittier and the ship. I know that it can be quite cool on the water, and I've planned on layers since I tend to be cool and don't like being cold! But do I need to have shorts for the Denali part? I've heard it can get really warm sometimes. I'm trying to pack as light as possible, still hoping I can cram everything into a carry on as I'm afraid of my checked suitcase not making it through my Minneapolis connection. I will have two pair of light hiking type pants and jeans (and black Athleta pants as "dress up"). Will that do or should I bring something shorter? Thanks in advance for your suggestions!