Three and a half stars, rounded up; a charming book, with fittingly "vintage", but detailed illustrations, written with _a lot of respect for children_, providing very specific tips on how to establish what activities will be good for your child (or the group), as well as great safety tips and suggestions of follow-up discussions for each activity.
What I think this book needed more of, and which perhaps is remedied in the second book, was more activities for single children, although I do understand this was to be, primarily, a resource for people who conduct group activities.