If you are a resort guest, you will be issued a resort ID/room key. You can keep that in your wallet, no need to wear it out. However, many folks wear lanyards and keep their resort ID/tickets in a pouch on the lanyard for ease of access.
No, no need to wear tags. They give you ID cards when you check in, just keep them in your wallet and use them as needed. They are also like a credit card so you can charge things to your site. Have fun.
You still get a "room" key - it's the plastic card that you can charge to if you have a cc on file, as the PP said. It still functions as your resort I.D., even though you have no door to open!