Tom - I guess it depends on if you just want the hotel stay or park admission as well.
When you check into the hotel you get a resort key which allows you to take all disney transportation to parks, etc.
If we are getting you into a park, then we would like to let you in first...there you get a park hopper ticket - allows admisstion to all four parks - then you can later drive to the hotel.
When your park time is done or you can then take a bus from the hotel back to the park or to a different park.
Hope that makes sense - Mike