Lanyard with a clip, and get them to punch a hole in the card at Guest Services. Get a lanyard where the clip is easily detachable — faster when you have to hand card over. I got one for three bucks in St. Maarten, but like this:

https://www.amazon.com/Lanyard-Lanyards-Lanyard-Key-Lanyard-University-Beautifully-Removable/dp/B07PNBYTH2/ref=sr_1_5?crid=2YYIYSEAWLS7V&keywords=lanyard+detachable&qid=1666583792&qu=eyJxc2MiOiI2Ljg3IiwicXNhIjoiNi4xNCIsInFzcCI6IjUuNzMifQ%3D%3D&sprefix=lanyard+detachable%2Caps%2C121&sr=8-5