The takeaway from the trip: These weekends are crucial to surviving residency as a couple. I would do anything to have a schedule that allows me to flee the coop when life gets too complicated. It's so important to take time for ourselves and be absolutely selfish about that time. We were both able to hit the reset button, and give thanks for the best gift in life- being able to move in mother nature with the ones you love.
Stay: Watchman campground was beautiful and affordable at $16/night. It had flush toilets, running water, and a dishwashing station. No showers at the camground, but if you go into the neighboring town of Springdale, there are showers you can pay for. If camping is not your cup of tea, you can stay at the Zion Lodge located partway up the canyon. You can also stay at any number of hotels/b&bs just outside the park.
Eat: We are obsessed with freeze dried meals. It sounded weird at first, but after two trips with them I wouldn't have it any other way. Outdoor stores carry loads of options- REI is my go-to for the meals, and they range from $5-$10. There is also a market outside of the park with food options, as well as a number of restaurants.
Do: During the high season (April-October), there are no cars allowed to drive up the canyon. You park at the visitor center and take a shuttle up the canyon that makes frequent stops. In November, cars aren't allowed on weekends. I found the shuttle to be very easy. It came by every 10 minutes or so, and we never had to wait more than ~5 min for one. My favorite hike was Observation point, and the other really challenging hike is up to Angel's Landing. For families or newb hikers the emerald pools and the narrows are great options. The narrows is a hike where you wade through the Virgin River into narrow parts of the canyon. The best time to do it is mid-summer when it's hot and before the late summer storms can lead to flash flooding.