An "entrance ticket" is a small paper or card that you show to get into a place like a museum, theme park, or concert. It proves that you have paid to enter and lets you enjoy what's inside. Full definition
Another good example is buying entrance tickets to a theme park. (autoquotenow.com)
If you reserve the private transportation tour option you can purchase entrance tickets and if you prefer to have a private guide at the entrance to hire a professional. (travelyucatan.com)
This is an additional entrance ticket that we can secure for you with an advance notice. (alpacaexpeditions.com)