Colleen,

When you book excursions online, the website will show your name and Ted's name on each excursion available for that particular port. There is a check box next to each name. So if you wanted to book a zip line excursion but Ted didn't, you would mark the check box next to your name while leaving the check box next to Ted's name blank. Ted would do the same thing if he wanted to book a different excursion while you were on the zip line excursion. Note that the website will not allow you to book overlapping excursions or excursions where the start time of the second excursion is not at least one hour after the end time of the first excursion.

Hope this helps.