I got a question i have been staying at the same casino for a wile  and the elevator security have been ok with me with different lady's but it is always on my mind you know does  anyone have a good way of passing  a key card

Met a girl once that didn't want to meet and walk up together
Met her in a bar. I knew what she looked like and she had a description and clothing I'd be wearing of me.
She sat at the bar I got up up and sat beside her and discretely slipped her the room card. left and went upstairs to meet.

You can always meet somewhere outside first or just at a specific place have them pick it up when your not standing right there.  Or better yet just get a hotel that doesn't require a key card or have security checking room keys.  there are a few

Just meet her at the place of your choosing downstairs and hand her the key card and then have her follow you upstairs in 5 minutes or so. This has always worked for us with no problems.