The BV Town run is definitely not for kiddies as not only is there the dam but there's also a swift-moving stretch of Class III that would be an ugly swim for little people if one were to have an out of boat experience. You can launch at Wilderness Aware for about $3 - $5 per boat and take out at Ruby Mountain for (another $5/car) a fun, splashy day with the kids.
Have a good time!
Nothing in the world is more yielding and gentle than water. Yet it has no equal for conquering the resistant and tough. The flexible can overcome the unbending; the soft can overcome the hard. - Lao Tse