You're already in a super cool spot. I have a really long story about trying a trip in Feb to go see Rushmore and then Devils Tower. Short version after 30 hours driving,one massive freak horror movie ice storm and then a white out blizzard with 40 -50 mph winds, I ended up staying in a hotel in Sioux Falls ,South Dakota for 3 days before heading back to Florida. They did have an indoor pool and whirlpool...haha...