We're looking at possibly doing a family reunion of my siblings this July. Around 12 adults and 12 kids 12 and younger. We're thinking about doing one of the national parks and getting a cabin for three our four days. With a group like this, generally not the outdoors type, which would be a better experience?

I'm wanting some good whitewater, some easier scenic trails and maybe a slightly harder hike for some adults. And other fun things to do with littler kids.