My fiance and I are providing a shuttle to the hotel following the reception. We'll have it booked for 3 hours, so guests will be able to leave their car at the reception and take the shuttle if they choose to. We wanted our guests to have easy and safe transportation following the reception because cab service in the area is not reliable. I already ordered the accommodations card for the hotel, and I didn't include a note about the shuttle - should we just spread the word via Facebook (private messages) or word-of-mouth closer to the wedding day? We don't have a wedding website.