Alabamajim, pack a bag and come on! The more the merrier we always say. You can be our tour guide. I grew up an only child, but my wife is one of 13, so we often have a sizeable group camping with us. In fact I think that the only reason there's only 5 of us going is because that's all I can fit in my truck. I'm pretty sure there has been whispers about some others following us in a second vehicle if they can figure out lodging arrangements.
Anyway back to the topic, I will check out the Lewis and Clark State park and see what else is in the area to explore. The Missouri Headwaters area might be cool to see too. Thanks.