I have been looking for bus tours that depart from Los Angeles to the Grand Canyon. I am interested to visit Las Vegas and the Hoover Dam on the way. Most of the tours that I found online include visits to shopping outlets / chocolate factory which are not interesting to me and tend to skip on actual sights like Hoover Dam or have reduced time at the Canyon. Do bus tours to the Grand Canyon from LA exist that avoid these side excursions? I am fine with a 2D/3N itinerary.