One is that our guide was both informative and helpful--adapting to the pace of the group; two the size of the group was under 12 and not requiring herding; three, guiding us through local transport was all part of the experience rather than a tour bus hauling us to tequila tastings, tourist hustles and a drive-by of the Virgin of Guadalupe. So we had ample time to explore the pyramid platforms, eat a bagged lunch and were introduced to how pigments were made for the chromatic rendering of walls. The tour attracts some younger travelers more interested in exploration than shopping for curios--though the opportunity is always there.