For the lanyard, I recommend getting one that has a retractable reel as well as a detachable clip.

We asked the cruise ship to punch a hole in our card sea card so that we could easily open our cabin door without having to remove the sea card from the plastic lanyard case. The detachable clip is useful if you have the drink package.

I purchased this one but it is currently sold out:

https://www.amazon.com/gp/product/B07TT4KTBN/ref=ppx_yo_dt_b_asin_title_o09_s00?ie=UTF8&psc=1