I think all you will need is your dive card. Since it's been three years, you will have to do a pool check, but not the resort course. If you don't have your card, contact your dive shop or where you got certified and get a copy or another card. Wait till you meet the dive guys at the resort, what a great bunch!
I am a certified PADI diver and I no longer have my dive book. Will CSA let me dive without it or make me do the resort course? It have been 3 years since my last dive.
They may make you do some skills tests in the main pool. Hubby doesn't keep a dive book so when we arrived at CSA last year he offered to do the pool course. They let him go out on the dive anyway and watched him then when they realized he is an experienced diver, he was good to go.
My husband didn't have his dive book the first time and he was okay. They'll asked when the last time was that you dove. Be honest because if it's been a while, a little refresher might not hurt. Better safe than sorry. If you dive frequently, it should not be an issue.