My husband and I are thinking ahead to the summer of 2008. We would like to go to Yellowstone and Grand Teton National Parks, probably 6 nights total. We have 4 children who will be 12, 10, 7, and 4 by then. The 3 older will be fine, but we're not sure about our youngest. Has anyone done this trip with a 4 year old? My husband and I have been to both parks before we had kids as part of a 16 day Pacific/Northwest trip, so we do know what the parks are like. But it has been so long and our perspective was very different then.

Another question, where is the best place to fly into from New York? Thanks for the help!