We're doing a trip to Yellowstone this summer as well. Lucky for me I'm not having to do any of the planning as its a trip my son's Honors/AP Biology class is taking. What I can tell you is we're flying into Salt Lake City, Great Salt Lake for a swim, heading to Antelope Island State Park, then headed to Hayden Valley, West Yellowstone, Old Faithful Lodge, Jackson Hole, WY, then white water rafting down the Snake River. Not sure what's being done what day, but we'll be there for about a week.

I'm looking forward to some of the information others have as well since I've never been out there either.