Suitcase will fit under the bed without any problems. I know because on my first (and possibly second ;-) cruise I had a 25" rolling bag and so did my husband.

Suitcases absolutely go under the beds on cruise ships so they don't take up any extra space If they don't slide easily, then lift up the bed a little and they'll go under.

The clips come in 6 or 7 sizes, so it likely would be a matter of studying their size chart and finding the right one.

I usually get a little chilled so an extra light cardigan/sweater comes in handy. I packed a teal sweater, darker teal cardigan w/ UPF protection, and teal windbreaker on my last cruise. People dining near my assigned table may have thought I only had a single sweater and just didn't say anything. Or we were too busy anticipating the lady who came in age inappropriate cocktail dresses.

I'd probably trade the teal sweater for a neutral that looks ok with a dressy outfit.

Pack some socks if you'd like to use the rock climbing wall. Zip line requires closed toed lace up shoes if you'll be on Oasis class.

No, it's called that Bandette Comb - it's just a hair comb (large) with overhangs for a hairband to fit. I can make the comb work ok but I can't figure out how to get the band around my hair. I watch videos and then try myself and I'm all thumbs!

I got out my Flexi Clips to check the sizes. I have a moderately thick, wavy hair down to my shoulderblades. For a French twist, I use either a L or XL clip (note: I don't like the way the video shows a French twist as theirs is untidy. With practice and wet hair you can get a sleeker, tidier updo).

For just pulling my hair back from face, I use a S or M clip.

If you have silky or slippery hair (I do) it really is easiest to style the hair when wet. I just tried to do a French twist with dry hair and it lasted about 3 minutes.