How can a Guest make a list of items?

I need to enable a Guest to select items in order, show them on a map, then have that list emailed to his computer or phone.
How can a Guest bookmark items, in order?
I guess Social Bookmarking and Tagging come closest, then to harvest the items in the list will require some custom code.

The Posters plugin is probably closest to what you’re talking about, as it’s already designed to have public users save lists or collections of items.

A modification to have this display as a map rather than a “poster” might be the most straightforward option.