We did the all day Browns Canyon trip. We have 3 kids - 10,13,15 - and they all loved it. The Noah's guides are the secret sauce compared to all the other rafting outfitters.
Our guide, Gabby, is first class in every way. If you can request a guide, Gabby's your girl. She was great with the kids, engaged with is personally during the simple float sections and was awesome in the rapids. She even brought candy along for the final home stretch.
If you do the full day, Noah's outdid themselves with lunch. It was gourmet sandwiches that were amazing. Now it's true that any food tastes good when you are freezing cold and hungry, but this was no PB&J with trail mix. Don't worry about going hungry.