If you're in the Boise area and you haven't done so already you should check out the Winter Garden Aglow down at the Idaho Botanical Gardens off of Warm Springs Ave. It's become somewhat of a tradition for la Familia Hanson. Even when the boys where young they loved seeing the lights and taking the climb to the top of the the small hill over looking the city. If you children are really small I'd recommend bringing the backpack carrier as opposed to a stroller. It's easier to navigate some of the trails with a backpack and the kid will probably stay warmer too.
They even offer free apple cider or hot chocolate and depending on the night there's a good chance you'll catch some local musicians playing Christmas carols or even Santa Claus himself (which although la Familia Hanson doesn't believe in Santa it's still pretty cool because the guy in the red suite hands out free candy canes!). All around it's a good time.