I would be so worried that the park tickets weren't good. You have no way of knowing until you get to the park. But then again, I guess if they weren't good, you could put in a complaint to ebay but I'm not sure what they'd do. I wouldn't buy airline tickets - they are in someone's name and I believe it's illegal to sell them - I'd call the airline first to see if they would accept them. When you leave the country they do ask for ID, so they'd know you are not the person listed on the ticket.