Eric, thanks for the heads up. We will make sure to bring warm clothing. Based on what we had read, it looked like we should be prepared for below freezing temps at the worst. Although I probably won't bring the snowshoes.
David, I am hoping for an awesome trip. We are planning on doing a lot of family day hikes, which are fun in their own way. However, those hikes don't always satisfy what I am looking for.
We do have the luxury of two cars and someone to drop us off and pick us up as we like. While I prefer some overnight hikes for my personal enjoyment. If need be, given all of the road crossings that I am seeing, we could break many of the possible overnight hikes into day hikes. We have thought about that with respect to the "Zion Traverse" hike, which is one we are contemplating. We might just overnight for one night from Lee Pass/Hop Valley/Wildcat Canyon/West Rim. That was just under 40 miles. That is two 20 mile days, which is about the limit that we'd want to do.
We may just play it by ear and wait until we arrive to decide where to hike. From looking at the reservation system, it does no appear that the backcountry sites will fill up on us. I could be wrong about that and disappointed if all of he sites are full.
Cola, thanks for the alternative suggestions. I was not even thinking that direction. I take a look at those.