A personalized thank-you card/note, for sure… telling them you appreciate their help and how it has helped you grow and/or become better at what you do. Doesn’t have to be long, just a quick thank you

For a small token: a fun badge reel is usually always welcome. Maybe a very tiny gift bag with a keychain-sharpie, a badge reel, keychain (tiny) flashlight. Things nurses always use and appreciate, not very expensive. Coffee gift card is normally always welcome too, but can be a little more expensive, depending on your budget