Hi... We are a group of 4 and would be traveling to Yellowstone National Park on the Memorial Day weekend. We are traveling from St. Louis on May 22nd and would be reaching Salt Lake City in the midnight of May 22nd. We would again come back to Salt Lake city to board a return flight to Saint Louis on May 26th evening. This is the duration we have and we would like to cover YNP and also GTNP. I know this is quite a small window but can you please suggest us as to how could we plan our trip effectively and also on the accommodation. This is our first time to YNP. We are all of the age between 25-40 and everyone are male. Hope to hear from you in affirmative.