We're driving...12 hours! Leaving around 4am Sat and staying in a hotel right outside the park area and checking in first thing Sun morning.

I have sunscreen...don't travel without it. I'm bringing yoga pants...jeans will be too hot, and I sweat too easily. I'm bringing a small backpack/napsack and putting a few things in it. A few days have a chance of rain so definitely a travel umbrella and poncho. I hadn't thought of bringing a jacket, but I will now. I was told we could keep small snacks in our backpack but not bottles (we will be given a refillable cup).

Thanks for the tips!