I purchased a ticket for someone but that person can not go can I use the ticket for a different person. We are going for the first time

Yes as long as u haven't taken a picture with that ticket you should be fine

yes, you can as long as its the first use for that ticket

Yes I've done it before

They're all right

Aa long thye haven't taken the pic you should be ok

If they are unused single day passes yes. If they are season passes, no. Names and pictures are associated to season passes once the vouchers are registered at guest services.

Yes