What advice would you give someone travelling with a grandchild for the first time?
I totally agree. I've been on two intergenerational programs -- and the third is in the planning stages. Let them be and, without any (grand)parental intervention, the kids are drawn to each other with the common goal to learn and have fun. The program guides/instructors/hired consultants are well-versed in working with kids. Just stay back and be amazed at how your grandchild adapts to all the new exposure!