We visited this site in July 2008 from Avignon and the bus schedules has vastly changed. There are now over half a dozen buses a day leaving for the Pont du Gard so it is much more convenient for tourists. We took the 10:45 one there and took the 1:15 one back to Avignon, spending almost 2 hours (more than enough time for us) to view the site. It was worth the effort and best of all, it is free to enter.