Have been to Yellowstone, Grand Tetons, and Jackson Hole in Wyoming, can't think of anything that a family with younger kids, that Disney is known to cater to, will do out there in summer. We went in summer and there wasn't much to do, we white-water rafted down the Snake River, and horse-back rode in the Grand Tetons which were both awesome but both weren't targeted to younger kids... so I guess Disney is planning to start catering more to adults than to the family. IMO I don't think this will go to well.