Hi, Manny:  We are coming to Cancun for a week from April 30 - May 7, 2011.  My husband and I live in San Miguel de Allende, so we are very familiar with Mexico, and my brother and his wife are flying in from L.A.  We are interested in a daytrip for the 4 of us from Cancun to Chichen Itza, plus stops at one or two other places, but it needs to be slow-paced, as my husband has some mobility issues. We saw the reviews on TripAdvisor and were wondering if Sergio is available that week and if there is a better day to go (guessing that Monday everything is closed, like most museums in Mexico). We look forward to your recommendations! Saludos desde San Miguel, Annie