I know a 1 day trip to Yellowstone is kind of a ridiculous idea, but... We are having a family reunion in Felt, Idaho, about 95 miles from the West Entrance to Yellowstone. Several family members have never been to Yellowstone and would like to devote a day of the reunion to visiting the park. We could either visit on Monday July 29th or Tuesday July 30th. Is there any difference in the number of park visitors on a Monday versus a Tuesday? Any other tips for day trippers? Thanks!