It is directly across the street from where they were directing traffic to enter the port. We were on the Dec 21st cruise, so it was a little chilly, dropped the DW and DS with the luggage(terminal security is good at giving directions) then exited the terminal, had to drive back to the corner where BOI is, handed the attendant the keys he gave me a ticket with the phone number on it and I walked across the street, its at an intersection with a light, and you are at the entrance you drive in (Terminal 1) short walk and your at terminal 2. When we cleared customs I called the number and our car was started and warm by the time I walked to it.
HTH
Charles