Sylvan Lake, Custer State Park, South Dakota.
I mostly wanted to post a picture of the beautiful Black Hills and Sylvan Lake, where we spent much of the day but I can't figure out how to do that on my phone. I will add it when I can.
Update: Oh dang it, I'm back at my computer & still not able to add a photo. But I couldn't edit at all till just now, so maybe something has improved....