Tourguide mike's least crowded information is for both on site and off site people. He tells you about every emh for every single day of the year, and evaluates it so you can tell if your family will benefit from it (obviously off site will never benefit directly, but indirectly, yippee) Its never 'always go' or 'never go' because there are so many other things that impact on crowds (like holidays, peak season, special events, and other things) Each day, and each family are individual cases, and he tells you how to figure out whats best for you.
It's very easy to either incorportate EMH into your tour plan, or avoid it, depending on the ages of your group, onsite/offsite status, ect.
HTH